If Collazo looked like a KO artist every time he landed against Khan, then wait till you see what happens when Brook lands.
Exactly, Garcia is not a big puncher, a solid puncher but that's it. Brook has a higher KO percentage than Garcia and of course is naturally bigger as well being a natural welter unlike Garcia who's a light welter. Brook has more than enough power to KO Khan If he lands cleanly. Doesn't mean he will win but he can definitely have Khan stumbling around like a drunk girl in 6 inch heels.