LMAO!! Viva! BJJ is all about NOT using strength!! Its all about technique!! The whole purpose is for you to take the bigger person down on the ground to take away his Strength and neutralize his ability to strike you (good for rape prevention).
heres an example, TKD blackbelt vs. BJJ blackbelt :
YouTube - rorion gracie vs taekwondo black belt challenge
Ps- The guy in the black shirt is TKD and the guy in the white "gi" (uniform) is BJJ.