One thing that I noticed -- the counterpointing in The Godfather: Part II makes it evident -- separates Vito from Michael.

At least twice in GF-II we see someone acting on behalf of Michael shot and killed when things don't quite work.

Yet, when one of Vito's men is injured in the raid on Don Ciccio's villa, they hold up their escape to rescue him from further harm.

It left me with the impression that the father showed more concern for his soldiers, and thus was more deserving of their loyalties.