Jeez, our offensive line consists of the worst LT in the league, an injury-prone RT, an old center that can't protect anymore and a couple of guards.
On the other side of the ball you have Roach, who hasn't done a bad job replacing BU, Briggs, Hayes and a couple of backups that have potential (DeCicco, Costanzo). Let's not forget that we still have McCellin, a guy who was a linebacker in college!
So yes, finding BU's replacement is important, but fixing the WHOLE offensive line right now is ten times more important.
I can't believe you're actually saying that LB is a bigger need than OL. What games have you been watching the past five years?