Hypothetical: If Moore said no, then what?

Anything could happen, but Moore is in a much different position from McDaniels. McDaniels was trying to get his 2nd HC job which he knew would be his last chance as a HC so he has to be even more cautious about what he is going to take. And the consequence for McDaniels was that he had to wait 4 years for another HC job and only the Raiders would hire him.

Moore has been on the interview circuit for a few years and is trying to get his first offer. If he verbally accepted and then changed his mind, it would be a bad look for him. Or to use the popular phrase, changing his mind after verbally agreeing to take the job would be very bad optics for Moore and could hurt him while looking for other HC jobs in the future.

Now, if he hasn't verbally accepted, all bets are off.
Yep, and it shouldn’t be forgotten that McDaniels is a grade A asshat.