Since the day he was drafted, he couldn't tell you whether he was a LB or S. That's a red flag. An OL may go from T to G or G to T, but they know they are an OL. Same for DB. McCourty and Malcolm Jenkins are rare examples where they were drafted high at CB, but played poorly and had to try another position at S where they excelled. They at least knew they were a DB. Edelman knew he was never going to play QB, so he put in the work to play WR. Other players have done the same. They created an identity.
Mapu on the other hand, has no identity. He's already tried both S and LB and has done very poorly. Can he rush the passer? If so, he needs to speak up and give the coaches something else to try him out at. I don't know about you, but if my job is on the line, I'm going to think about where I could excel, have a conversation with my HC and really work on that - not wait until where coach puts me. So yes, I'm going to keep saying this until he decides where he wants to play or he's cut.