I can't find the exact quotes but it sounds like you know the ones I'm talking about. Where it states Elendil and Gil-galad overthrew Sauron. That has always been debated as whether meaning Sauron or "Sauron's forces" were overthrown. But if you think about Gollum's quote where he says he has 4 fingers on a black hand then it surely points that after Gil-galad and Elendil had overthrown him Isildur came up and cut off the ring. Not by a lucky blow, or a slice that Jackson shows or Sauron would have lost more fingers instead of just one.