The Godfather III ending, u could say was a rehashing of the ending from GF II. They both end with michael sitting in a chair, alone, after he has a flashback that brought him to this point.

In GF2, the flashback was the family together again, before Sonny, Tessio, Carlo, and Fredo get killed, 3 of which Mike ordered.

In GF3, the flashback were of the women he loved and loss: Apollonia, Kay, and Mary.

With this version in GF3, i guess it pretty much says he has tried and ultimately failed, regardless of how much he tried to get out of it. I felt it was appropriate. Didn't have the strong impact like when Vito died, though i guess it's to symbolize how alone he truly was.

When Vito died, they had the royal funeral, when Mikey died, it cut to black.