Yeah, that is my meaning too. They can add more into CON after reached those stats, if they wish. That would be smart, but their strength is also not very strong, so I also think they would add more into STR too. So I gave an advise as: "STR/CON". Perhaps 1 into STR and 2 into CON by every leveling up would be good too.

Fire and Wind users are kinda aggressive types.
Water and Earth users are defensive and support types.
Those are their strongest points.

I did on purpose to let every element to have a good WIS. Because they will have fully assistant skills, also a big SPmax and a good protection against magical offense. So in my theory, the wind users can protect enough against magic with a good WIS to prevent to be fly away. Be dead is no problem, because they will be revived by a healer.