A little secret - I'm the child of a shrink. I am; my mom's a shrink, and my father's a lawyer. So believe me, I analyze and negotiate. That is a huge amount of the director's work, especially when you're working with people who - such a variety.
There is no one who likes a challenge more than Tom Cruise. Believe me, there was never any discussion of lip syncing or another voice or anything like that, because if the guy's going to hang out on the top of the Burj, he's not going to let anybody do his singing for him.