I think if Colas' only issue, was his slow success at the plate, he wouldn't be sent down. The problem is, he's had these lapses of judgement in the field and just overall, that have to be corrected.....ESPECIALLY if your GM talks about exactly that, being an issue.
BUT, as SCCWS said, the AAA season is basically over, so the timing is stupid. Reeks of "We're going to back up what Getz says, even if it makes no sense!"