He's being forced to do things he's bad at. It's like if all we asked Aaron Jones to do was pass pro, you'd say he sucked.
Brice being asked to play this way is directly tied to King getting hurt. My guess and maybe @AlexGreen#20 can confirm is that they trusted King to play M2M without help. This let them play 1 high with HHCD, Brice was attacking alleys and flats. Now they don't trust Tramon, Alexander, Jackson or House with the same responsibility thus we're playing more 2 high and Brice's side of the field is the easy target.
Brice is a missile to the ball on front of him, I'll keep reiterating this fact. He absolutely has a use and he can be damn good at it. Right now he's totally in his own head and everything is suffering, even the aspects of his game that are quite good. We need Kevin King back.