Another possible solution, whenever a brother level’s up, 3 numbers are randomly chosen. These you can allocate as you see fit, with a few exceptions. Maybe only 1 or 2 fours’s possible to be rolled at once. Also maybe the 4 would be highlighted in red, or some color to indicate it can’t be spent on Melee attack/def.
This would allow the player to spend the high rolls how they see fit, according to their build.