Anthony Joshua sees his rematch with Oleksandr Usyk as a big opportunity for him to reclaim his status in boxing. Anthony Joshua isn’t pretending that changes weren’t needed in his camp if he’s to once again rebound to reclaim three major world titles in his Aug. 20 rematch with Oleksandr Usyk. This is sort of familiar territory for Joshua, who dropped all of the same titles to Andy Ruiz Jr in one of the biggest surprise upsets of the past few years in 2019. Ruiz, however, is not Oleksandr Usyk, so on top of hiring Robert Garcia to be his…