Hello:
You do have a point, I hope you'll be able to come up with the necessary ideas to get the new characters to know Longtail. But at this point, and for you to avoid getting more confussed, try to work on 1 character at a time, from the nearest one that will pop-up in the plot to the farthest one.
I think that will take some time to figure out, but if you work calmly, then you should have more chances to get things right without having to rewrite entire chapters :blink: .