i'd just like to know which player or players hold the record for most super bowl rings won with DIFFERENT teams, and with how many different teams, and how many rings they won, whether as a back-up or starter.

also, which quarterback holds this record?

Matt Millen has 4 rings from three different teams. Raiders(2), Redskins(1), 49ers(1).

For Quarterback, Joe Montana and Terry Bradshaw have 4 each.