Bengals haven't done enough to address O-line problems.

[*ochocincos*]

As of right now, the only position they NEED to address is RT.
Karras can play all IOL positions, and Hopkins was far better in the second half of the season than he was in the first half, so he can be a stopgap at C.
As much as I'd like another OG added so that Karras can cover C, I'd be ok with Karras playing LG this season with Hopkins at C while Carman develops another year.

I have a gut feeling the Bengals (and Pollack specifically) are eyeing Daniel Faalele in the draft, and if they take him they'll start him at RT Day 1.
There's naturally concern with an OT so big that he isn't as mobile as some other options, but that might be less of a concern if they Bengals shift their run game to more of a downhill or inside zone run game.
The positives of Faalele are that he has incredible length and size, so it's hard to get around him and (nearly) impossible to move him.