There will be a ton of disappointed people when Volk easily cruises past Topuria. It's become fashionable in the past year to proclaim Topuria as the man to dethrone Volk, but I don't see it (unless Volk's chin was cracked by Islam's shin).
I expect Topuria to be champion at some point, but he's still pretty inexperienced. The best wins on his resume were against Emmett and Bryce, both of whom are very rudimentary on the feet. Volk's striking is far more nuanced. Topuria obviously has a puncher's chance, but outside of that, I don't think he offers much resistance to Volk.