User blog comment:Jimlaad43/Extreme 2, but every episode is a 10* Robot Rumble!/@comment-6123787-20171030131605

Kan Opener and Bigger Brother for reasons already stated

And for the all stars we need to think Longevity and only 3 robots I could feel can go the distance and that's Bigger Brother, Firestorm and Tornado. Now out of the three of them I believe that Bigger Brother could beat Tornado and we know that Firestorm can beat Bigger Brother

so my picks to win are

Firestorm IV Kan Opener Bigger Brother