He was slippin'

Originally Posted by Lana
why did Michael need to visit Roth at all --

why would the Mighty, Top Don Michael Corleone, visit his subordinate who, according to the Don himself, had just “tried to have Michael killed” In my home! In my bedroom!

Turnbull's point raises -- Is this how Michael envisaged the Rosato brothers would fail Roth?
Then the possibility--perhaps the probability--that the Rosatos would try to kill Pentangeli, didn't escape his eye

If the mission failed, leaving his NYC muscle operation in his enemies' hands, then Michael loses his muscle and becomes just another casino operator, easy pickings for anyone. No more Mr. untouchable

If it was the three territories which Pentangeli presumably was handing over, “settle these problems then why kill him?

Why tell Roth Pentangeli is a dead man, then dispatch him?
They would have got them anyway and perhaps more with Roth's backing after Pentangeli is whacked No blood shed as internal disciplinary whacking

Michael put his head into the lion's mouth Both stringing each other along Both saved by Batista's resignation