Come on, this one is easy and it's clearly Tony DeAngelo.
First game of the 56 game shortened season and the Rangers are losing 4-0 in the 3rd to the Islanders. TDA takes a holding penalty and then gets a misconduct for yapping to the officials. Quinn makes an example out of him and scratches him for the next game, and the one after.
First game of the season and he scratches a veteran because he took an extra 2 minute misconduct out of frustration in a game they were losing 4-0.
I'm not defending TDA at all, but how many other coaches are going to do that to a veteran after the first game of the season? Things spiraled out of control from there. He scratched him for 2 games and TDA lost his #1 PP QB spot to Adam Fox. He never got it back when he returned to the lineup. They lost 4 of the next 5 games, and everything boiled over when TDA was a -3 and the OT lost to Pittsburgh that led to the blow up and fight with Georgiev. Drury later said in an interview that TDA couldn't put the benching behind him and things snowballed.
A more veteran coach, or maybe a coach not trying to show the team who's boss and make an example of a player, probably just has a conversation with DeAngelo after that first game and that's it. It's water under the bridge and things don't spiral out of control.
Definitely a learning experience for Quinn.