Stout secondary=poo if you can't get pressure on the QB.
CB is the last position you fill when building a defense. Just as WR is the last piece you put in when building an offense. Look at the last 5 drafts, of the CBs taken in the top of the first round.
2006 - Tye Hill
2007 - Darrelle Revis
2008 - Leodis McKelvin
2009 - Malcolm Jenkins
2010 - Joe Haden
The only one on that list that made a significant impact on his team, as a rookie, was Jenkins. Why? Because the Saints had already filled out the rest of their defense before drafting him.
You can even look at last year's draft alone. Joe Haden had a very negligible impact last year. The CB taken after him, Devin McCourty, went too the Pro Bowl. The difference, the Pats already had 10 other pieces in place on D.
So who do we take a DT?
The whole not taking a CB #1 is a weak argument. If Peterson is the BPA, take him. Peterson is the most highly touted Corner to come out in a While. He is a Freak at his position, similar to Peppers at DE Calvin Johnson at WR etc. Our division is FULL of big QB WR Combo's
A guy like Peterson who can Blanket those top WR does a Lot for a D. These QB's will have to check down to other WR's who we will have Gamble and captain munnerlyn on. With a Pass rush coming at them it will make it tough.
And yes we will have a pass rush even without drafting a top DL. Resigning CJ beside of Hardy plus the new DC is a HEAVY Blitz guy.
Go even farther back than 06
Since 2002 here are the DT's that have gone top 10
2002- John Henderson (9th), Ryan Sims (6th)
2003- Jonathon Sullivan (6th)
2007- Amobi Okoye (10th)
2008- Glenn Dorsey (5th), Sedrick Ellis (7th)
2009- B.J. Raji (9th)
2010- Suh (2nd), Gerald McCoy (3rd)
Not many of these guys made a rookie impact either.