Literally that entire team was trash and it was largely because Eichel and Ullmark were both injured, their coaching sucked, and the team quit.
Pretending that anybody devalued a recent Hart winner because of a bad half season with a dogshit team is hilarious.
The entire team quitting included Hall who has a reputation of that and hence his value reflected that. He was not a better player by any means than Hertl now in a less valuable position. Just stop embarrassing yourself and quit while you're only this far behind.
Hall was in his second consecutive disappointing season where his issues followed him around to three more teams.