No it's not. It's a reasonable assumption. Valencia played exclusively thirdbase and, evidently, had attitude issues that may have impacted his lack of improvement. The Twins seem to be giving the job to Florimon based soley on his defensive ability, so it's clear they see an improvement even if you don't. Look, when you state that it's an "awfully big assumption" for a player to improve at a position he's ostensible still learning, people are going to wonder if you're being honest in your assessment. Maybe I'm being unfair, but lately it seems that you'll spin any contentious point so that it paints the Twins FO negatively. If there's any ambiguity, you (like a train of others posting lately) will argue tooth-and-nail that such ambiguity proves how stupid the Twins have been. And for the record, I always have the higher ground.