Actually, I think I can say it a little better.
The Dline is underachieving talent, whereas the secondary is just way in over their heads.
Faggins is not a cover corner, and the safeties probably would have hard time to find work in the NFL if they were cut by the Texans. You can't say that about the Dline. All of those guys are going to get jobs if the Texans released them.
How can you call Travis Johnson an underachiever if he has never achieved? People want to peg him as lazy, but maybe he was never someone who was worth being picked in the first round. I'm not saying I have the answers on this, but there has been little in his play that makes me think, gee, all our DT problems are over.
Seth Payne was a very good player, but he got a bad injury and is on the oldish side.
And the rest of the DTs are basically either practice squad guys or over the hill guys.
Babin/Peek really aren't great fits for the defense, and Weaver is okay.
I am encouraged with how young Williams is, his potential upside and the attitude he has shown, but really, there is nobody on the rest of the line that makes me think that the Texans will magically develop more of a pass rush no matter what sort of scheme the coaches run.
Yes, a new better corner would be terrific. But geez, the entire defense looks like a list of needs:
1. A consistent pass rushing DE
2. Defensive Tackles.
3. Outside linebackers
4. Safeties
5. Another corner
6. Football smarts mixed with talent
Another corner would be great but unfortunately everybody is looking for that too.
I'm not the biggest fan of our defensive coaches, but you can't make chicken salad out of chicken...beaks. (Well you could, but it wouldn't taste so good.)