Well, TB, Q, and Pete ya'll make good points. However, I think we are all prisoners of the drama created by FFC's epic and the storyline he wanted to follow. Because of that, there are no satisfying answers to our questions.

I asked in a post above why Roth's wife didn't miss Ola when Roth was taken to the hospital since Ola was apparently in the same hotel suite when he was murdered. I also asked why Bussetta chose to strangle Ola which could have resulted in a struggle that would have alerted the others in the suite instead of using a knife or bludgeon, or a pistol with a silencer. I also asked what possible reason Fredo could have for waiting for what was probably 6-7 hours until almost midnight to possibly alert Ola or Roth to Michael's murder plans if indeed he did try to alert them (which I don't think he did).

Well, it's safe to say that we will never know!