On the surface, I'd agree with you. I have no idea how much time they devote to special teams, so I can't say it's too much compared to other teams.
As for roster spots, I think Moorman, Lindell and Neill are a given. Roscoe does bring something to the offense, so you couldn't count him as strictly a special teamer. As for Corto and Costanzo, it's hard to say if they would have even been on the roster had Crowell, Digiorgio and Bowen stayed healthy for the year. So, that leaves Wendling. According to todays Buffalo News, he was the highest-rated ST player, so maybe it's okay to keep one person strictly for special teams. But it would be nice if there was some possibility of him seeing the field on defense. I guess you could even add Jenkins to the list as a strictly STer.