Well, I think Johnny Ola was the kingpin in the shooting and it was done by his men, thats my story and I am sticking with it. Lets not forget the orange that Ola gave Mike, that was a DEAD give away that he was in on the plot. Anytime gifts were given, such as the C-note to Frankie, a subsquent murder attempt was made
It definitely is a dead giveaway, but let's also not forget that it was the orange-jacket-wearing Rocco Lampone who handed the orange from Miami to Michael, "on behalf" of Ola.
Lets not forget the orange 
that Ola gave Mike, that was a DEAD give away that he was in on the plot. Anytime gifts were given, such as the C-note to Frankie, a subsquent murder attempt was made 
