Ya know, I honestly can't argue with any of these theories. However, there is one question that still remains unanswered: Where WAS Fredo going? It's obvious he wasn't really going to get himself a real drink - he was up to something.

There are 2 things about that scene that don't make sense: Where was Fredo going, and where did the military guys come from? It just seems logical to me to put 2 and 2 together and say that Fredo alerted them.

When you think about it, though, the theory that has the president sending an escort to get Roth out safely makes the most sense.