You're assuming Josh McCown will be the opening-day starter, and I happen to agree with you even though it's not quite a done deal.
Presumably, coach Todd Bowles, who needs to win games to keep his job, won't bench McCown if the team is winning. Beyond job security, what kind of message would it send to the locker room if Bowles demotes a productive player?
General manager Mike Maccagnan is looking at the big picture, and he recognizes the importance of playing Christian Hackenberg. Personally, I think Hackenberg needs at least 10 starts to get a fair evaluation.
The question was mostly about the Jets getting off to a good start, and how it would make getting a look at Hackenberg more difficult because the team would have to bench a successful McCown. Cimini feels there will be an internal struggle between present and future at the position at some point this season. Cimini added Bowles and Maccagnan are both level-headed men and should be able to tell the difference between charade and reality should it get to that point.