Maybe Ninkovich would not be a starter on most teams,but he would certainly be one of the best backup linebackers in the NFL.
I think a few years down the road many will agree with this.
Maybe Ninkovich would not be a starter on most teams because most DCs don't approach the game through the same defensive concepts that BB does. OTOH, maybe Ninko would eventually have been similarly successful, but in different ways, had the Eagles or the Giants, say, decided to invest as patiently in developing him as BB has. Like Vrabel, Ninko has been a very solid player who makes the players around him "better", and he seems likely to remain so for a few years while other, more "dynamic rookie" players come and go around the league.