If someone is going to face Shigematsu, it doesn't necessarily have to be in IGO's side. It could be from the Bishokukai. Alfaro or Kuromado might arrive and cross path with Shige and they start to fight.
Well, it would be interesting if Mansam is still standing and Zebra joins him.
Then it would be quite a fight. I still doubt they would be able to beat him, since he seems to be at his 100%, while Mansam had a fight before and is now wounded by Shigematsu and Zebra seems to have also lost quite some calories while protecting and then sending tons of spectators and then while having a skirmish against Nitro and weak beasts, but still it should be an interesting fight. I hope Mansam won't die though.