how effective is going to the body if you are shorter?

like say someone who is 5'10" against a 6'6" guy. we see a lot of head hunters, but calvin brock vs. wladimir klitschko, i saw something interesting. calvin brock was hardly able to hit wlad's head, i'm not sure if he caught him on the chin once. but he scored a lot when he went to the body. so what if someone with power made this their primary attack? you know, a bodyhunter? are there any boxer's out there like that right now? and lastly, is it effective against people who are trying to clinch a lot?