I think Cain is going to be a huge step for him on short notice. I can see Kongo beating Cain... but it will be a hard fought battle.
Either way - Lesner or Mir would have their way with Kongo on the ground IMO. I'd like to see how Kongo tries to deal with the break neck speed of a Lesner take down.
"I fight because I can't sing, I can't dance, and it beats working all day. Now ask me a question that doesn't sound so fucking stupid."
"He did exactly what I wanted him to do and he knocked me the fuck out"