And if he's not the best, he certainly is in the conversation.
Mickey Stanley not withstanding, you don't move gold glove outfielders to the infield (and Stanley was pretty much a desperation move). We KNOW what Betts can do in right (and even center). We have no idea how he would be at 2nd. I'm sure he'd be passable, but he hasn't played but a handful of games there since he came up, and a pennant race is no time to experiment.