First off, Stoudermire ended the season playing really well at DB. He wasn't just better than what we had before, he was playing really well. I have no doubt in my mind that he will be the best DB on this team (no offense to Royston).
As far as the DEs. I can't say that I am overly surprised. Everyone I talked to about the RS players last year was gushing about Botticelli. I tended to think he would end up playing DT (still might in a couple seasons). Now, I think that it is probable that the first unit Dlineman were more like our 1st down (looking to stop the run) unit. The suprise players (Delaney, Botticelli, and KGM) are all guys who are big for their position and probably more thought of as "run stuffers" than "pass rushers".
I guess my point is more that I would expect to see a lot more substitutions along that DL depending upon the situation. In a situation like that, it's a little difficult to call someone a starter or a backup.