Wasn't Girgensons "LITERALLY AN ALL STAR" at one point?
I don't necessarily want to take anything away from the guy, but his production dropped when he got to the Sabres even before the injury. He was an all star because he's a great dude, the team stunk and didn't have a captain, no one really stood out, and Eichel was still considered a bit green for that sort of thing and/or they wanted to give him some time off after the constant ankle injuries.
That deal had Moulson 2.0 written all over it from the start.