About the guy in Ekko's video...

Many thought it was Urgot, some thought it was Singed. Riot confirmed that it is neither of the two champs. I think it could be a Sion skin. Some evidence that I have..

1. The big guy has a robotic left leg (Sion is missing part of his left leg)
2. They have a similar skin tone (This could be a coincidence)
3. ?? You may be thinking "What about Sion's axe?" Well, we don't really know how long Ekko has been fighting this guy. Ekko could have made his axe useless... who knows. Maybe the next skin is something like Augmented Sion or Bioforge Sion

I'm wondering what you're thoughts are as to who this mystery guy is.