The gang at Pro Football Focus examined a handful of second-round rookies (actually I think it was the entire second round), including Bengals defensive tackle Devon Still.
It's a bit late, prior to the Green Bay Packers game, so apologizes for the delay (we've been a bit busy lately). Here's what Neil Hornsby writes:
After playing only seven first-half snaps against the Jets (one of which was a QB kneel) we got to see a lot more of Devon Still against the Falcons in Week 2, playing more than twice as much. In both weeks Still was tested far more as a pass rusher than a run defender and he hasn’t stood out as a particularly dynamic or powerful interior player in that regard. He did collect some pressure though the majority of this has come by way of almost a gift from the offense than a great play by Still. His hit against the Jets came as a result of some dubious pocket presence from Mark Sanchez, though he did well to stick with the play to record the knockdown. Twice against the Falcons he was turned loose to pressure the quarterback. The only play where Still really flashed some power was against the Falcons’ second team on a play where he drove right guard Peter Konz back into Chris Redman. We’ll wait to see more from Still in the regular season, but at the moment he seems miscast in his current role in the Bengals’ defense.
I've always believed that the preseason isn't ideal for an accurate judgment of a player, especially for rookies often trying to get their feet underneath them. Especially for rookies during the new CBA with reduced allowances for hitting and collisions.