If you watched Zach Wilson play last Sunday, or basically since he was drafted, this news won't shock you: Oddsmakers either don't see any difference between Wilson and any other quarterback on the New York Jets, or they think simply ditching Wilson is an upgrade.
The Jets were 4.5-point favorites at BetMGM against the Chicago Bears on Sunday before word came that Wilson would be benched. After the news of the benching broke, the line was Jets -4.5. There wasn't a change at BetMGM even before it was clear who would be taking over for Wilson.