doesn't seem to answer the question, which has also troubled me in the past, how did Vito know that 'whoever comes to you...is the traitor' just instincts or what? i suppose it's pretty logical if you know Barzini is behind everything and is gonna arrange a meeting to have him assassinated but that leaves the questions... how did vito know for sure Barzini was behind everything, watching the meeting a few times there isn't really anything that gives this away for 100% absolute certain. And then even if he knew that how did he know that Mike would be assasinated at a meeting arranged by someone close to mike? was there really NO other way in which they could have got to Michael? these things could i suppose have been guessed. but they don't really seem that certain...enough to order the death of one of your oldest friends over? i think Mike would have wanted to be certain before killing off Tessio.