I didnt think that paying more had anything to do with it...only the fare class and medallion status. I would think its possible for a Silver on a K fare to have paid more then a Diamond on a L fare in some cases...especially if originating airport was different.

It is technically possible that a FO could be sitting in E+ on a T fare and a DM in coach on a K fare..because the DM wanted to sit in Y for whatever reason (exit row, sitting with co-worker, who knows)

The only question is if E+ is now a factor in the Op-UP process. Most people do not seem to think so, but there is a lack of evidence I think..