Until they find a consistent pass rush, NONE!
Let's face it, they got toasted by Peyton, granted they had a inordinate amount of injuries last year, the losses of Kelly, Mayo, and Vince are huge, but none of them are pass rushers!
I like Jones, Hightower to DE is an interesting idea, worth a shot. But still the Pats lack a truly dominate pass rusher, one that HAS TO BE accounted for and one that leaves others with one on one blocking. Regardless of how good you are in the secondary, you can't cover anyone for more than a few seconds, then they are going to get free. We have terrible safety play! With WIlfork, Kelly and Mayo all back, the defense against the run should improve greatly, however I think the loss of Spikes might off-set those gains.