I think Martin may be in the second 10, Squire. If you just focus on upside, I think you're right, but there is too high a probability he never learns to make enough contact to play in the big leagues. I might think he was top 10 if he projected to stay at SS, but everyone seems to think he's a 2B or a CF.
On another front, here is an Abel picture
HIs arm is SO far behind his shoulder; wrapped around his body. Isn't that one of the predictors of rotator cuff injuries?