What deal?
15 minutes ago one member used the term "pending",,,,,, and another one "good faith"
It's literally impossible to enact the deal
before electing a Speaker because you can't approve the rules and appoint committees until after the Speaker is elected. So at that level, a certain amount of trust is required.
However, the deal is for changes to the rules and for committee appointments, which are things that happen almost immediately after the Speaker is elected. If McCarthy chose to go back on that deal after being elected Speaker, the Freedom Caucus would immediately move to vacate the chair, and that motion would pass. So McCarthy would be right back where he is now except with his reputation destroyed.
The more rational thinkers within the Freedom Caucus clearly have figured that is the kind of promise you can actually trust. It is only those operating on emotion and personal feelings who refuse to recognize it.