Tahoe shooting “was a brilliant plan” with all the “moving parts” beautifully fell into place and the assassins right outside Michael's bedroom window with the drapes open, to machine gun spray such a confined space as a bedroom

The plan would have worked brilliantly if the assassins were professional contract killers! and could hit their target!!

I believe it was Turnbull who posted a credible theory that if Michael had died in the Tahoe shooting
  • it would have caused the maximum chaos, destruction and pretty much totally annihilated the Corleones or similar
  • All Roth would have to do would be to sit back and let them fight each other then pick up the Corleone casino holdings after all the bloodshed

Besides if Pentangeli was suspected even if just initially, the Corleones would have lost their muscle and been even easier pickings

If there was no Tahoe [unsuccessful!] attempt and if Michael had died, in Havana it would seem such a terribly unfortunate death, caught up in the midst of the rebel uprising in spite of being escorted in a military car

Roth would have still got rid of Michael but without all the fanfare, fireworks and for the same end result perhaps only taking a little longer

Havana hit would have been perfect and foolproof because Michael would have turned up in Havana totally in the dark, relaxed and confident in Roth-Michael, father-son alliance!