I'll entertain this as best I can. By going up to WW and facing someone like Colby he'll be able to answer the critics and pundits that think his success as an overall fighter is because of the "Size advantage" he has over LW's that can't wrestle. Seeing how 170 is mostly a wrestlers shark tank, and Colby is up there, if he beats him, no one can really give him shit afterwards.
If he beats Charles at LW, it won't be much of a surprise to some people. Do Bronx may be the Champ, but him getting handled on the ground by Chandler was very telling. The difference in their top game is NIGHT and day.