[panzerfan]

Then again, every single member goes to Kyon for advice and whatnot... even Mikuru wants him there for several mission-critical objectives. Koizumi does more or less confide in him quite a bit about the state of being which... if told to the others might not work so well to his interest.

Kyon is person on the most solid footing comparing to any one of them. Furthermore, he cares genuinely and at times will call it when things are going too far regardless of who the individual is. It isn't just to how critical he is as an element to all of their mission but the fact that his solid footing means that he can steer far better than anyone else in the storm.

The other element though... it is clear that all of them like him. That I won't really comment.