Yeah, this is such a Tom thing to do: just get completely hung up on a totally unnecessary hypothetical move hinged on a player who MIGHT be enough of an upgrade to justify the cost.
I don't know how that works. This is what I was looking at before: http://www.statcorner.com/CatcherReport.php There's been a bit more separation between the two, but seemingly not much (if I'm looking at it right).
I remember looking up Realmuto's framing grades when he was tossed around as a pickup option, and I'm pretty sure it looked like he was barely an upgrade form Contreras in that regard. I know that's probably a terribly tracked metric, so someone feel free to show me I'm wrong.
What the horsefeathers happened to Contreras in August? We knock him, but outside of a bit of a June swoon, he has been fine with the bat this season (or better), but last month he's just hit the wall.