[b]Not trying to be snide - but - DUH.

The point was that Obito was warping. He warped several times after he absorbed Torune. Then he warped a bunch more times after he absorbed Fuu and he had both of them in there. He warped when he went to get Sauske. He warped when he dumped Sauske in front of Danzou. He warped when he escaped from Danzou's sealing technique. He warped when he left Sauske. He warped when he came back to get Sasuke away from Naruto. He warped TONS of times and never once did Fuu or Torune ever so much as try anything. If you were trapped in a mystery dimension and body parts were appearing and dissappearing out of nowhere wouldn't you at least TRY to grab onto them once or twice to see what happened? If they were obviously the body parts of your enemy, wouldn't you take a shot at them? Just ONCE? If you were a SENSOR wouldn't you be able to tell when/where they were showing up? [b]
Sorry - but the average stock-boy does less reaching than this. If this dimension is hypothetically endless - or 'miles' big even - then why is every single instance taking place in the same spot in this fight? If Obito's dimension is huge and he can dump people wherever he wants in it then WHY on earth is he having his phased body parts appear where they can be hit? If what you are saying made any sense then Obito would dump Kakashi and Naruto way out in some BFE part of his dimension, and have his phased body parts appear somewhere completely safe.
If he could do all the things you guys are claiming then he would be invincible. He would literally have no weakness. Nothing could stop him. He could have just warped up to anyone he wanted - sucked them up (INSTANTLY putting them in a genjutsu) and warped away knowing nothing (even stuff in his dimension) could possibly hurt him because he could just dump it anywhere he wanted and warp himself in some other safe part. The hits Naruto & Kakashi have gotten would not be possible.
Come on guys. Why can't you just bring yourselves to admit that his is a big, huge, massive, stupid fuster-cluck of a PLOT HOLE? Either Obito should have been hashed by Fuu/Torune OR he should have genjutsued Naurto/Kakashi when he sucked them up. There is no other choice here unless you just accept a bunch of illogical, implausible hypothetical bad excuses.