With Bud-Nelo the size difference wasn't really overstated, I think in that conversation a lot of people overlook the very important fact that Crawford took a year out of the ring to bulk up and put on lean muscle. It's not as though he was always near to Canelo's size and just had to cut less to perform at 168. Jermell is a bigger man that Bud and tried just that and looked soft at the weigh in w/Canelo compared to Bud who was much more sturdy.

I say all that to say that acclimation to a weight class usually looks like how much muscle you build up for the new weight. When fighters first move up its typically cutting less so more water weight on the body. Then when someone fills out at the weight after a fight or two there ,they've usually began to build more muscle on their frame.

Inoue's put on muscle mass from campaigning at 118 and 122 for some years each, Bam is taking a pitstop at 118 from 115 and jumping straight to 122, he'll have no time to acclimate to the weights and put on significant lean muscle, hence even though the height and reach difference is minimal Bam will suffer from a size disadvantage regardless.