You're right, whoever wins (besides Reigns), we win. Randy Orton is a possibility tough, I see him having more chances than Ambrose or Ziggler.
I agree with the first part here.
Doubt they'd go with Orton, to be honest. But I see him, Ambrose, Ziggler, Rollins, Bryan, Reigns, Rusev (maybe) being the remaining men in the Rumble. After that, I don't care who eliminates who, as long as Bryan wins.