Valid polints 90Caliber. At least you back up your opinions with fact from the movie.

Do you believe that if Michael would have suspected Rocco as being the traitor who almost had him killed, where his wife slept, where his children played with their toys, that he would have kept him on the compound, where his wife lived, where his children played with their toys, for so long?

Would Michael have let Rocco sit in on a meeting where they were planning how to get to Roth?

I just don't believe that he would have. Michael trusted no one after the hit attempt. He even tells this to Tom. So there is absolutey no way, as far as I'm concerned, that Michael would have let Rocco live had he suspected him, let alone give him free reign around the compound.