Man Bednar really did put that much of a leash on Z. While here he was capable and occasionally would throw a big hit, it wasn't like he was laying Scheifele out every game or two. His reputation for hitting was bigger than most of his actual hits here. If memory serves a not insignificant amount of his penalty minutes here were due to clean hits, but the officials would still give him 2 minutes for being big.
I still don't know why Bednar had zero patience or use for the guy, but hindsight being what it is, Jared pretty much wanted Z off his roster from day 1.