You get 30 motes from doing the D200. You only need 15 to create the ability. The other 15 you can either use to fully dive that sphere on one character, or you can put those 15 toward another copy of the ability with a different character, or you can use it to unlock the ability to use 6* Samurai on 3 other characters. So I dove Gilgamesh and Orlandeau to R2, each one getting me an R1 copy of the ability.
I guess the real question is whether Samurai motes will ever come back again. Because if they don't, I'll never be able to create another copy of the ability.