plawrence, you made several good points, it would have to had been someone in the inner circle to have made it into mike's bedroom to open the curtains and not arouse any suspicions and not be stopped and questioned. but i believe that when mike said to tom that vito told him "to think as those around you think" he knew how everyone around him would react to the shooting and how he could manipulate that to his advantage. i have no doubt that neri and rocco were 100 % loyal to mike or else rocco would not have shot roth in the airport knowing that he was also going to end up dead shortly afterwards. also, how did rocco get that limp when he showed up and was speaking to mike ? i believe you brought up a point earlier in another post that the assasins were brought onto the estate in one of the catering truck and dropped off after the reception or the guests left. mike had no reason to doubt fredo until the scene in havana when he revealed himself.