Only issue I had with Topuria fighting Islam off the bat was that he was still FW champion, so you could say he wouldn't be as big as he could be if Islam beat him. Now with him committed to moving up, the "FW" argument is moot, Topuria's fought at LW before anyways.
It's hard to top KOing Volk and Max back to back, you could say that basically proves what he'd do standing with Gaethje or Poirier. He should probably get one of those guys to earn a shot, but if Arman is a question mark there is no one else.