No, we don't, and frankly, after seeing what Thompson and McCarthy have done with this team, I still don't understand why fans seem to think we need to trade picks for players. We went through this same crap last season with Marshawn Lynch, and we all know how that turned out.
But I digress. No, we don't need to add another pass rusher. I think we need to get some guys back and healthy but we don't need to trade draft picks for someone else's cast-off.
When you look at pass rush stats, Green Bay has the same number of sacks as Detroit on the season so far, and that's without Zombo, Mike Neal and with a banged up Clay Matthews. For what it's worth, Minnesota and Philadelphia are tied for second in the league for sacks while the Giants lead the league.
http://www.nfl.com/stats/categoryst...sonType=REG&tabSeq=2&qualified=true&Submit=Go
Plus it's not like we're not getting pressure. Green Bay has 27 hits on the quarterback so far this season, better than 5 per game. The Lions, by contrast, have hit the QB 19 times. Minnesota has 26, Philly has 28, and the sack leading Giants have 31 to date.
http://wp.advancednflstats.com/defteamyear.php?year=2011&team=GB&season=reg
As you can see, our pass rush is fine, and will only improve once we have Zombo and Neal back. Even without them, we're still generating plenty of pressure and sacks. There's no need to panic and there's certainly no need to give up draft picks in the middle of the season for a guy that's not likely going to make a big difference anyway.