Just spent a few minutes looking through Sweeney's highlights and man..
He has a lot of high quality highlights, but also has only 1 error and 3 Assists already.
compared to Sizemore, a perrenial GGer, who has less put outs, 0 errors and 0 assits.
I think he makes a very strong case but does not have the bat or the media attention to win the award.
Also, not that WebGems are a valuable measurement of a players defensive abilities, Ryan is currently in second place among all players (1st among all OF) in WebGem points behind only Brandon Inge.