Mostly agree with everything said, I believe his tachiai should be more forward and a bit less upward, because when he is stood up, he's fairly helpless...
Clearly injuries have hampered him, but I recall a YT video, I believe the first one of him ever uploaded (at least under his shikona), where is is given a serious work session by ex-Tokitenku who seems to insist heavily on him going lower and staying lower, including making him crouch-walk as low as possible around the dohyo (also include Harumafuji slapping his ass with a broomstick, as a very special bonus), so it might be an issue rooted in his morphology too.
Either way, it's a bit sad to see him struggle like that, his emergence made those bashos very exciting!! Let's hope he finds his groove soon!