Remember when naruto first attacked and chouji wanted to back him up? yamato stopped him because chouji would get caught in the jutsu too. so if kakashi and yamato provided distractions, they would get caught in that big whirlwind thing the jutsu made.Originally Posted by Assassin
it seems naruto himself got caught a bit too so it would make sense to use clones so they can just dissappear if they get hit instead of kakashi or yamato themselves.
and theres also that "please dont stop me from crossing the bridge" thing blah blah blah...