No, I don't think Ruiz would beat him, and it's not a given that Joshua would beat him. Povetkin maybe, maybe not. The thing is with Wilder, even in fights where he looked poor against poor opposition, he came through with something brutal. And Luis Ortiz, despite his age, was actually a good contender and a skilled southpaw, with a decent chin, and Wilder took care of him twice. Monster puncher, with tons of heart, long reach, awkward style. Wilder's a serious opponent for anyone.