I think that, before the shooting, Roth really had Michael conned into thinking that Michael could take over Roth's empire without violence--and that Roth would simply fade away to a retirement of playing shuffleboard and pinochle with all the other Florida geezers.
Yeah when Ola tells Michael "our friend in Miami will go along with.." - Michael looks like he believes it... but what was really going on in his head?
"What I want.... whats most important to me... is that I have a guarantee" - Train approaches.... Bang! Bang! Bang!
