In previous threads I had defensive tackle, interior offensive line, and quarterback as the top three weakest position groups on the team. Hard to pinpoint a next position group but I would say that cornerback or linebacker would follow. Each has a couple of solid veterans and some youts with upside.
I think linebacker probably would be more of a concern because you have Pace and Cashman who both had good season last year. The hope is that they continue to play well. The concern is the depth behind them. Kamu Grugier-Hill is a veteran with 6 years of experience and is now on his seventh team.