I think ths card is in London so who gets crowd support? Probably Werdum due partly to his name and partly due to Brits being Russophobes. Not trying to offend any Brits on here but I have noticed an anti E.E. sentiment from their fight media and fans.
Volkov is peaking now and Werdum is at the point where he could potentially get old over night at any time. But I don't think it will happen. Werdum SUB in 2 or 3
If he can get that far and remain vertical(his BJJ isn't as good as Tyburas) he might be able to get one of those high kicks through and get the stoppage. Tybura was having a ton of success with them against Werdum and legitimately hurt him at least once.
If Werdum will imagine himself as a very "steep striker" (as was the case with Stipe) i think Volkov will knock him out, but if Werdum will be very careful and make bet on the wrestling he will win.