This is all rather ironic, in that your support for Florimon is based on his defense being "much better" than Drew's, but when pointed out to you that at least one of the primary defensive metrics used (and the one used in Fangraphs WAR, which is often thrown around here as evidence) doesn't support that opinion, you then tell us that defensive metric isn't valid, but your defensive metric of choice is.
You have every right to think Florimon is as much better at defense as Drew is at offense. But let's not pretend either one of us can prove or disprove opinions about defense, or that defensive metrics are in any way as precise or reliable as offensive measures. For that matter, lets stop pretending we can forecast how a player that won't turn 31 for another couple months will age over the next three years.
For the record, my opinion is that Florimon will probably be a bit better defensively over the next three years. I also think there will be a huge gap offensively in Drew's favor. In my opinion, the gap between the two is big enough that while Drew will most likely be a major league shortstop in 2016, I will be surprised if Florimon is.