"But it's the fighter that counts." No, you are learning effective skills. It would be ignorant to say the style is doesn't matter. Put that boxer back in the ring with BJJ'er again and see.
Ok, so if its just the art, Senin, then, by your example, a guy with a month of BJJ training is gonna be able to take on someone like Nagato sensei?
LOL. OHHHHHH KAY.