Ishida did not move up. He fought James Kirkland at 160, Paul Williams at 160 and Dmitry Pirog at 160 prior to GGG. Dude is 6'2 big guy.
Like I said, Ricky Burns ducked Broner but who the fuck is ricky Burns anyway? There are/were no names at 135. Broner grew out of the division he was huge. Like I daid, he turned pro at 19 his body was still growing. GGG turned pro in his mid 20s he's already grown.