It seems like a lot of CB doesn't regularly watch the NFL. Obviously CB is not one unit, but many many CBers were way too optimistic. The Jets are awful and even if this new coaching staff is good, it'll be like trying to U turn a yacht. It's going to take some time.
Zach has shown flashes of brilliance in the very rare occasions where he didn't have to immediately start scrambling to avoid a sack, but even if he had a solid O Line, he's still going to have some serious growing pains in the NFL. Rookie QBs just aren't very successful in their first seasons.
I believe Zach has the skills to be a solid NFL QB, but time will tell if the Jets can do anything with him. It's no coincidence that Sam Darnold immediately looks significantly better after leaving the Jets organization.