I kinda am with you in that the Anderson example makes me want to take more guys that are just so physically gifted - quick hands, bat speed, etc - that they can just physically adjust so well even if they aren't maturing so much in approach.
But, Timmys production was so consistent across each level, every jump and he was moved fairly quickly, that I'm not sure you could say he wasn't developing and improving as he moved up.
Adolfo was making a pretty good case before his set-back. He started making more contact to tap into his power, getting on base more.
Also Forbes just suddenly started walking a bunch.
But there aren't a lot of "wow they just suddenly tapped into that power/avg/obp" examples.