Ok, guys and gals, what do you think.

In the 1960's, Michael and Castro become friends. Boston don orders hit on Castro. Michael is driving with Castro and gets fired at. They both survive. Its disguised as a Castro hit. But Mike doesn't believe it. he finds out Chicago, Boston, and Barzini Junior are involved. Two meetings of La Cosa Nostra. JFK is murdered, by NO Don. FBI finds out Mike and other dons met with NO Don 1 month before hit. They all go on trial. Michael killes the other Dons, eliminates witnesses, goes free. Mike murders the Boston Don and friends. Mike becomes Capo de Tutti Capi. Cicci, Rosatos, and others get knocked off. New 5 families. Hagen starts a lawfirm.

70's and 80's- I'm not there yet.