SOMETHING EVERYONE SHOULD HAVE ALREADY NOTICED!
Kakashi's kamui only works fast enough when what ever he warps is coming straight into the kamui. Any time he does it to a person or something it always takes more time. And that time would give madara the chance to stop him. Now dont get me wrong if he catches madara dashing in for taijutsu or anyone else besides tobi and he does it there done for. But think about it, everything that kamui every takin out quick was coming right for it. Deidara's explosion, Sasuke's arrow, the nail pain tried to kill him with, and the kunai tobi kicked at naruto all went straight into the kamui. But everytime he attacks a person with it it takes more time, deidara, Gedo Mazo and there was someone else i just cant remember. I believe if he's attack something that isnt comeing directly into where he places Kamui it takes more time.
And another thing i notice. On a thread like last week alot of people who were on this thread were saying that tobi could beat nagato becuase he could use that warp jutsu on him. Why is everyone now saying that that can be absorbed by madara, but no one said it could be absorbed by nagato? Cause im positive that since Nagato has waaaaaaaaaaay more experience with rinnegan if anyone was to do it, it would be nagato.