when I flew BOS-ORD with AA in january they had this zone. i expect it to be the same kind of experience on DL....
It became crazy. People were trying to get past the GA to board with huge carryons. She wasnt having any of it thankfully. I was in one of the first Y zones (because I got bumped to MCE due to IRROPs) and they wanted everyone to gate check their carryons. I slipped by and noticed 3 of the same exact bags I had getting gate checked
The best was when a Chinese man and his wife tried brining a big box on board and keeping it int heir lap... FA caught it immediently and he threw a fit.