I know where your going with this comment apple and as for that being a hole in my theory. Well Tom wasn't involved in that part of the Family business in the second one. So I doubt you can count on him as a reliable source of information. Even if you do you might realize that Tom thought of Michael as becoming to paranoid and Tom wasn't happy where the Family was going. Remeber the conversation between Tom and Frank in jail "it once was." I think Tom was giving the information to try and see if it would stop Michael from killing Fredo he knew Michaels intentions and thought it wasn't a good idea. Plus Tom was never good with dealing with a person getting killed close to the Family. Remeber the look on his face as he sees Tessio getting put into the car.