Why would
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Clemenza promise the Rosato brothers three Corleone territories in the Bronx after he died. Rosato's contract!
according to Pentangeli
Quote
Clemenza promised them nothing. He hated those son of a bitches more than Pentangeli does.
and I believe him [Pentangeli]

Once a common Mafia hood -- Michael needs Pentangeli as his muscle
Otherwise Michael becomes just another casino operator, easy pickings for anyone

  • What was Michael expecting? to happen at the Pentangeli-Rosatos meeting
  • my take, Michael was not expecting Pentangeli to come to any harm other than the humiliating back down, perhaps handing over the three territories and in the process looking weak etc.
  • If Pentangeli is killed by the Rosato brothers - Michael can't afford to let his man's murder go unavenged - danger of starting another war
  • Besides if Pentangeli is killed and Rosato brothers, Roth's ally take over the Corleone operation then Michael loses his muscle Pretty soon there won't be one place in Nevada Michael can hang his hat!
  • Hence Michael would never want to lose his muscle which is the only thing that makes Michael untouchable

So....
  • Why would Michael envisage the Rosato brothers would fail Roth
  • and How

It was indeed unbecoming of a Don
1. Michael “undercut Pentangeli through his support of the Rosato Brothers” against his own man
2. Michael gave his loyalty to a Jew [Roth] before his own blood
3. Michael asked Pentangeli to lay down - settle these troubles - to the Rosato Brothers who spit right in Pentangeli's face
4. Michael threw Pentangeli [good old man -- who was loyal to Vito, Michael's father and to Michael, for years] under the bus
5. then abandonment of his 'dead' capo's family