Thank you, Turnbull, for this work.
However, I think the sloppy timeline is here:
Original geschrieben von: Turnbull

9 – 12/46: “But it was to be another month before Michael recovered from his injuries, and another two months after that before all the necessary papers and arrangements were ready. Then he was flown from Palermo to Rome and from Rome to New York” (354).

To me it also feels a little inconsistent with the story. The paragraph almost reads as if Michael orders his return to the US. And it must have taken more than two months before the "arrangements were ready". Arrangement No.1: the deal between the 5 families. I think the meeting must have taken place later than September '46.
Arrangement No.2: Find a person to blame for the killing in the restaurant. It must have taken some months until the Felix Bocchicchio opportunity came along.