It’s about the frame.the frame that he would be putting muscle/weight on it....
Kell brook FRAME is much smaller than Spence, CLEARLY, and he’s 5’9
Fist damn near twice the size of Brooks (hand size is irrelevant just saying)
If you can’t see that he can EASILY go to 154 and probably 160 I don’t know what to say
He’s bigger than Lara and probably would have more mass than and be bigger than dudes like Julian Williams and Lubin
Dude handles the Charlos in camp for gods sake
Dude fights at welter cause it gives him massive physical advantages, that’s his right as he can make weight but cmon