By draft day, the Bears should know if Briggs is gone or back (though if he's franchised, you might still need an LB to replace Briggs after a year). I wouldn't pick a LB in the first round to replace HH just because HH isn't on the field as much as the other two LBs and the first rounder could be better off looking at S or OL. Don't get me wrong, I really like Posluszny and think he'd be a great fit on the offense, I just think there are bigger needs than LB if Briggs is back (same thing in regards to TE).