If this is only about LBs, then those three are about the best, taking in their current situation, with Keith Brooking being very close.If this discussion is about defensive players and solo tackles, Rodney Harrison is a man amongst boys.
Brooking isn't even close to tie 1. Not only will Hartwell's presence hurt but so will Demorrio Williams'. Demorrio probably has the most talent in that LB corps but he is SLB. If Williams was playing MLB or WLB he would blow up this year. No way does Brooking get any more than 82 solos this year.