Repentence can be quite temporal. It definitely is not legitimacy.
Again, as both I and TB have pointed out, Michael did not walk away. He enabled Vincent.
Connie manipulated it. Michael walks away and Vincent turns to Connie and says..."It is done." Questions: Could Michael have stopped Vincent from choosing this path? And was Michael's real motive to see the illegitimate empire continue or to manipulate Vincent to give up Mary?
"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"
