Your knowledge exceeds mine. I've lived under delusion that crew on Explora are paid flat salary when signing a contract. The crew does not expect gratuities. It is not a separate line item. If a segment has ten or 900 passengers, crew are paid flat rate.
Of course, any passenger can do what they want to do for tipping individuals. It is contrary to the original intent of all inclusive and why crew fund is popular to express gratitude.