18. Houston Texans - Sam Baker, OT - U.S.C.
The cornerbacks remaining, such as Talib and Cason, just don't seem to fit that well with the man coverage scheme the Texans typically employ. While the signing of Jacques Reeves won't make anyone think the Texans have completely solved their secondary problems, it does free them up to take a player that would be a tremendous boon to their up and coming offense.
In my opinion, Baker has been overanalyzed and at this point is a steal at 18. It's hard to ignore that Baker was a four year starter at one of the nation's top programs. Baker can step in and play right away and protect their Schaub investment. He has great footwork and would be a terrific match to the Texans style.
Although fans will be disappointed if Stewart isn't picked when he's on the board, this pick is much more sensible. They simply cannot just hope that Charles Spencer can come back from injury.
Houston is short on picks and long on holes, but I would absolutely love for us to take an OT. For the exact same reason you cite, we need to keep Schaub upright and healthy and not let him get shell-shocked like Carr did. Lots of fans want a RB, but we didn't cut Green and nothing about Kubiak/Denver running scheme suggests 1st round RB, particularily with so many other problems at other positions.Corner is a likely option here, but as you said, you're remaining guys don't fit the man scheme. Same thing with Kenny Phillips, FS is a major need, but everything I've read on him says he's more of a zone kind of guy. Houston is a likely candidate for a trade down (needs picks and is in the late teens where trades are often seen.)