As I understand it, when players are elevated from the practice squad, they don't automatically get put on the 53. Because of covid, you are allowed two "free" PS calls ups each week to suit up for that game. The same player, though, can only be elevated twice...so you either keep them on the PS after the second call up or you can elevate them. I believe this was Zimmer's second call up, so they either had to elevate him to the permanent 53, or not be allowed to use him the rest of the season. If I am in error in my understanding of the rules, please someone correct me so I don't mislead others.