The Godfather Novel - What did Don Vito Corleone see in Rocco Lampone

As user Danito on 23 May 2009 perhaps aptly posted
Extract:
Michael's bodyguard in Havana, Bussetta died on the job

That's what happens! if you turn up with a coat hanger for Ola and try to improvise with a pillow for Roth [Rocco take note!]

Well, Bussetta was technically not one of Michael's 'regular' men in the family
Ouch! Is that why Michael didn't even bat an eyelid when Tom told Michael at the Desert Inn “Your bodyguard is dead”