I disagree with your first point, I think Smith will try to re-sing Dunta because they don't want to let him walk and get nothing for him. Hopefully they talk some sense into him and show him that he's not worth the contract they offered him last year and can sign him for a reasonable offer and then trade him for a 2nd round pick. They could also use a transition tag on him, reducing his salary and making him easier to trade. This move would probably really piss him off and he'd be a holdout like this year. I'm actually 50/50 on whether or not Dunta will be back next year, he's a very good #2 CB but only an average #1 CB, there's definite room for improvement. I agree with your last statement though, if he's not re-signed then CB becomes our highest priority in FA and the draft. Hopefully we can pick Joe Haden.
Badboy made a good point, if our undersized DT's keep improving and this system works there's a good chance the Texans may not go after a huge NT/DT and actually may not pick a DT at all in the draft. They may decide that Okoye is an every down DT and that Robinson, Okam, Cody, etc... will make an effective rotation at the other DT spot. They could also move Smith inside next to Okoye and if Barwin improves play him full time at the other DE cause he should be bigger and just as fast next year. I wouldn't have a problem if they didn't take a DT at all since the additions of Pollard and Cushing we've been much better able to stop the run. This would allow us to focus more heavily on the O-line and secondary, the teams 2 biggest needs. It's sad though that everything we do or speculate on is dependant on what happens with Dunta.