We have 4 ILB. The best one, Barnett. The best in run defense, Hawk. The best in pass defense, Chillar. Better than the last two, IMO, but not according to the coaches: Bishop.
Barnett plays on every down, now that he's ready to go. Hawk plays on running situations (base defense). Chillar, on passing situations (packages). Bishop, for some reason, doesn't play, unless 2 of them are injuried.
There you go! If Hawk wants to play more, he should improve his coverage ability, and/or his pass rush. Until then, he'll only play in run situations...