Years ago, someone surfaced an earlier script in which Pentangeli was deliberately spared. It was one of many such plotlines ultimately either abandoned or left on the cutting room floor. I think FFC figured that it would have been too much of a stretch for Roth to have engineered that split-second rescue of Frankie.
It was probably the same script that was referred to in this thread, which isn't an earlier script, unless ofcourse you can proof that it was. Most of the scenes in this script were filmed, but a lot of material was left out of the final cut as they otherwise would have had a film of five or six hours long.
