Perhaps. Rusev seems to have more momentum right now for me. One scenario I did think of... Reigns wins and has 2 titles and Rusev wins here to push for the US title.
I think this little RuRu/Cass feud may be a one-off, which is why I think Cass will emerge victorious. The dude's in line for a push next year, too.
However, if they're going to continue it all the way till the RR, then yes, RuRu's probably winning at Roadblock in order to keep the feud going.
Also, Cass saying "I'm not Enzo" this past week on RAW was clearly WWE acknowledging that Enzo is the weak link of the duo, and to me, that came off like Cass is guaranteed to win.
So, yeah, I'm still going with Cass winning after a distraction from Enzo, or as Rusev would say "Enzio". But, we'll see.
As for Reigns, I don't think he's winning. I think KO retains one way or another.
If the US title was on the line, as well, then I'd put my money on Reigns winning. But, this way, nah. Maybe if he turned heel, which I doubt.