It was the back injury he suffered in May that messed him up. He had a minor upper body injury when we first acquired him, but he was fine by the time his quarantine was over and it did not stop 2 other teams from offering the same price that we did. That injury had nothing to do with his back.
My issue is that we spent a 1st round pick on a bottom 6 quality rental who was not very good in the first place, regardless of health. The injury made things even worse, but it was a bad idea from the start. He provided some good defensive value, but his offense was pretty much in line with a bunch of healthy scratches we had the entire year and his physicality/leadership ability is overrated.
Effectively, Foligno was worth a 3rd or 4th round pick at most but we decided we desperately needed to have size, physicality, and leadership in the lineup... The same reason why underperforming players like Thornton and Simmonds played the entire year over guys who were better players.