He was a great lead blocker for Gore the last time he was here. Most fans don't get very excited over players who only block, but I for one would be happy to see him in red and gold again. Plus it would mean one less position of need in the draft.
Evans has said that he's looking for a team where he can start. He has the size to be a 3-4 DE, but I'm not sure he has the strength, and I can't see him starting here. Maybe they want to convert him to OLB since he's shown some pass-rush ability. Most likely they just hope he'll settle for significant playing time at the DE position.