Sure thing Evita “Just the one assassin [already in-house] not three No doubt less risky less complicated”

Roth had indeed "overthought" the plan being fixated, in framing Pentangeli and ended up in a tangled web
Huge and unnecessary risk, smuggling in and then hiding the two assassins who would have had to wait around until Michael entered the bedroom “when whoever killed them [the assassins] could have [easily] carried out the shooting himself Simpler”

Besides wasn't enough time? after the machine gun fire when everything was galvanized into immediate action – sirens, spot lights, guards, dogs and everyone was running around all over the Tahoe compound – without being seen, among others
  • to kill the two machine guns armed assassins
  • to drag their bodies into the ditch, where they were found
  • to hide their machine guns

Coppola and Puzo too much anisette!