Could someone please post what is the best crew to have in the final region?

I think it depends on what your goal is. For example, if you're looking to max resources and trade goods, you're going to want 4 terracotta merchants, but if you only care about XP and story voyages, they are useless. Personally I have the following:

Mine is almost exactly the same as Red's. I have one ship devoted solely to each of the three stats (morale, combat, and seafaring) and then a final one to a balance of all three. A big part of this is merely because I'm lazy and don't have to shift around crew members.