You really don't know much about movies as you even stated, do you? If filmmakers decide that focusing on just one character is much easier than having him share the attention with four other characters: I've seen it on several occasions, as they place the other characters into the background permanantly, while keeping just this one character in the foreground. Given the severe lack of screentime and dialogue I thought the others had last time, while focusing almost solely on Littlefoot, it has me just a bit suspicious with what they might do with the series now.