Personally, I think this list is more accurate, and here's why.
1.) Sharptooth (that's a no brainer. He killed Littlefoot's mother and tried to knock off the Gang of Five a few times. He even tried to take Petrie with him in his last moments.)
2.) Plated Sharptooth.(he gets higher than Sierra because he's a Sharptooth. Also, he's bigger than Chomper's parents and also seems to be able to own them individually, if not when they are together, and that alone makes him pretty dangerous. The fact that he snaps at and tears apart a bush that the kids had been in moments before makes him creepy.) He also can leap great distances like the original. Also, he seems quite willing to kill, not minding what he kills. He had the kids cornered against a cliff, where they were trapped between him and the swimming Sharptooth in the water. He seems willing to whack Chomper when Chomper gets in his way. Heck, he still is willing to fight when both Chomper's parents come along, rather than giving up the kids as a bad job (which, ironically enough, had he done that, would have almost certainly spelled the demise of the kids, as it seems Chomper's parents only spared the kids because Littlefoot rescued Chomper. He wouldn't need rescuing then. It would be the end of Littlefoot & co anyway, a very painful end too. The only way out woulda been if Chomper had persuaded his parents not to eat his friends.) Anyway, Plated Sharpteeth is knocked into the water, much like the original, and, like the original, he decides he isn't going down alone, this time taking Chomper instead of Petrie. Chomper is rescued by Littlefoot while Plated Sharptooth presumably drowns, just like the original.
3.) Sierra (This guy would make a good Sharpptoh villain, as it would suit his personality more. Not much says "I'm evil and I like being that way!" like comments like "You should be used to this sort of thing by now?" and "Once we take over, I'm feeding those overgrown eggs to the Sharpteeth!" And, let's not forget, he tried to do in Ducky many times, and wanted the kids dead and even tried to kill Pterano. He wanted to enslave the Great Valley, rather than make it better, which was what Pterano was after. Also, he has this sort of "I hate the world!" attitude that makes it quite clear, he doesn't care who dies as long as he's happy. Also, he might still be alive, unlike the two dudes above. Also, his appearance even LOOKS evil. )
4.) Rinkus (This guy is less evil than Sierra. However, he is pretty nasty, also wanting to kill Pterano and also wanting to leave Ducky on the mountain. He also wants to enslave the Great Valley. He also appears to be loyal to Pterano, while plotting with Sierra to kill Pterano. Also, he could also still be alive too.)
5.) Red Claw (Yes, he may not seem that dangerous, but if Sharpteeth and Leaf Eaters alike are scared of him, you an bet there's GOT to be something really bad about him. Perhaps he has a Sharptooth army we don't know about yet.)
5.) Ozzy (He doesn't mind murder over a bunch of stupid eggs. I mean, come on dude, you coulda had a nice omelet snack while the grownups were busy dealing with Chomper's parents and going to close the Great Wall, but no, you had to go and try and whack Littlefoot instead! Also, your treatment of your own brother is awful! He just wanted to be a leaf eater! You try to chase the kids (who appeared to think Chomper had eaten Littlefoot and were downcast too, come on, can't you at least let them mourn their friend buddy?!, and then try and either claw or strangle Littlefoot too. Later, you want to give the kids baths in lava. Also, you try and get the kids again. And, when the fire is coming, you order your brother to give way to you, yelling "I'm first! I'm first! I'm always first!" to show what a selfish bastard you are! You realize Strut coulda died man! Later, you try and get Littlefoot and were gonna be the one who offs him. Definitely evil!)
6.) Ichy (He can fly and he's a Sharptotoh. That's two lethal combinations. Yes, he's a bumbler, which is why he loses out to Rinkus and Sierra and Ozzy. However, he does have good vision and does most of the directing of Dil, who cannot find the kids on her own (she didn't even know she had Ducky on her nose for goodness sakes!!!!!) His size seems to be what's holding him back. He almost seems to be an "evil Guido". Also, he is the one that points Dil to Littlefoot, grabs Petrie and may have gotten him, if Dil hadn't argued with him, and woulda gotten Ducky, had Petrie not interfered, sending Ducky to Dil instead. Also, he has a greater chance of survival than Dil as nothing chased him at the end. Also, he is the only Sharpooth flyer type shown (other than the one that tried to eat Ducky in V.) whereas Belly Draggers appear both in IV (though that may have been Dil too) and in X and in the TV series too.) )
7.) Dil (Her Myopia makes her less dangerous, despite her bigger size. However, he attempts to whack Littlefoot, Cera, Ali, and Ducky, not to mention her attack on Ichy, make her pretty bad.)
8.) Strut (He seems to be the victim of his brother and so seems odd to be on this list. However, his kooky, yet evil, laugh near the middle gives away that he is really bad. Further, he doesn't seem to question his brother's murderous plots to kill the kids at all. Indeed, he is Ozzy's sidekick in them. Also, he helps tackle Littlefoot and was the one who suggested murdering him by throwing him of the Great Wall. He also I think was the one that grabbed Chomper and looked like he was going to strangle him. He is only rated lower as he seems a few tree stars short of a branch in some ways and doesn't eat eggs, or doesn't like too and appears to be a coward and let himself be pushed around by his brother.)
9.) Topps (He is good, overall. However, he is really bigoted, goes crazy during the water shortage (though some of his behavior can be, according to Toops, what his father, who may still be alive by the way according to Topps. Also, the fact that Topps uses the words "may be what I am today" hints that he may not have talked to his father in some time. Anyway, Topps almost gets Cera killed when, thinking he knows more than everyone else, he goes trying to dodge the wildfire, and he and his daughter are nearly roasted. Also, it was his brilliant idea to separate the herds in the fifth movie. Also, he isn't very nice to Tippy's herd and constantly whines how Littlefoot and the others, specifically Littlefoot, is a bad influence on his daughter. Still, he's got balls and fights off Chomper's father, Red Claw, and loads of Belly Draggers. He's fearless, albeit hardheaded.)
10.) Hyp (He gets on this list for how he treated Littlefoot and Co, wanting to bully them. he can be forgiven, one thinks, perhaps, as he was treated the same way by his father. However, Hyp gets Littlefoot in hot water, or splashed water, with Topps, which is the reason Cera has to meet Littlefoot in secret for the film as Topps won't let her see him because of that. Also, he was gonna hoard that watering hole, despite how thirsty everyone was. That's pretty selfish man! Also, he was gonan go off and get water for himself in the Mysteirous Beyond, as he knew where it was, not even bothering to tell the grownups, who could have helped him. Also, one would have thought that he had reformed after III, but, given that Littlefoot didn't want to meet him in the TV series, I'd say he still has a few flaws. Also, he was gonna smash the Fast Biter eggs, which seems cold. However, he seems, hopefullly, to have finally become nice.)