#1 Rusev

What an intense difference in styles this presents: we have the size, agility and brute strength of Rusev against the hardworking, refined Dillinger. A feud would all be about hope, and how Rusev doesn't just want to destroy the hope a country, but more specifically of Dillinger.
These two likely have not crossed paths unless they did ever so briefly during their time in NXT together. The returning Rusev is in the midst of a feud with Randy Orton, which could also present some interesting and challenging obstacles.
However, we should make no mistake that Rusev's intensity and strength are something that always garners heat from the audience. When we couple his intensity with the desire of Dillinger, we could see a fun and exciting challenge for the Perfect Ten.
We don't necessarily foresee Dillinger winning the war, but just being involved and getting the upper hand occasionally would help his push.