We went to AK twice during our trip and rode FoP with FP. Once you actually enter the line, it is all twisty & turning and not easy to see far in front of you. Even in the FastPass line, I stopped once to take a photo and the other 2 in my party got a good bit ahead of me. I would not count on sending anyone ahead - your pace should be with whoever is slowest so that your group doesn’t get separated.
Try to read both of these posts - lots of good info in them about FoP lines!
On this one, scroll down a bit for the Animal Kingdom part - excellent feedback on the line to get to Pandora at rope drop!