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Originally posted by Turnbull:
I also believe that Michael may have felt that it was possible for him to return to "civilian" life after Sicily. But when Sonny was killed, and then Appolonia, his course was set in concrete.
No I totally disagree. There was nothing that could stop him for becoming the Don. He was the smartest and because of his characteristics (calculated but deadly mind) he would be a big mob boss. The killings of Sonny and Appolonia helped a bit, but I think the desicion was already made when he decided to kill McCluskey/Sollozzo.