Besides hydration, what could POSSIBLY be the reason for this?
Coralie: We usually ask our divers to start in the afternoon trip since our morning dives are usually deeper
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Coralie: so on your first diving day we prefer you to start with the afternoon dives and then on the next days you will be more than welcome to join the AM dives
Coralie: this is a safety protocol we have
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Coralie: As I said our morning dives are deeper (around 90/100fet)
Coralie: and the current can be strong in Cozumel some days
Coralie: so as we do not know you as a diver yet, we like to start in the afternoon trip
Coralie: As a dive master you probably have some experience but as a dive master you also know that safety is very important in diving
Coralie: In pro dive safety is our major concern, so this is why we have some rules
Coralie: Now, it is also depends on your experience
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Coralie: So I would have to check with the dive center if you can maybe start with the 10 AM dives
Coralie: what is your experience ?
Coralie: How many dives do you have logged ?
Coralie: We can make some exeption
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Coralie: You can dive after flying, this is not the problem
Coralie: I am talking about safety and depth
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Coralie: So if you give me more info about your dive experience
Coralie: i'd be happy to arrange something for you
Coralie: and maybe organize morning dives
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Coralie: I would check with the dive center how we can arrange AM dives for you
Coralie: You wrote me 85 dives thsi year, but how many dives in total ?
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It could be just me, but that seems like a pretty clear explanation of why. And never a statement that it's a REQUIREMENT. It seems pretty clear (to me) that they will make an exception to what they PREFER if you give them the info to let them know that you (and your buddies) are indeed qualified to do the morning deep dives.
Again it could just be me, but this comes across as someone who wants special treatment because they are a freshly minted DM and maybe the next thing to be revealed was going to be that at least one of the other divers in the group does not have sufficient experience to satisfy ProDive that they would be okay to take on the morning deep dive (when judging just based on credentials). Maybe the OP wanted to be able to take a not-experienced-enough diver on the deep dive on the basis that the OP is a DM and should be able to do what he wants? But he quickly realized he wasn't going to slide that one past ProDive, so he cut them off and moved on?
I'm not very experienced as a diver. I have been out on at least 10 different charters, with at least 5 different operators around the country and in Mexico where "advanced" was required. I have never yet had a problem getting approved in advance to go on these charters. All without lying about my experience and without having to go on any "checkout" dives first. It has seemed to me that honesty, courtesy, and a good attitude have always gotten me "there".