Went to fuck around somewhere else with his suiciding habit perhaps? Because there's no way that someone who was on a mission to slaughter Whitebeard would run away from Snitch. And we would've heard of an emperor's defeat if Snitch emerged victorious. And if Snitch didn't win but got the upper hand he would have at least been lightly damaged. But none of that happened.
What happened in canon was that Kaido got some fine tasty West Blue rum + a Road Poneglyph
I'm looking forward eventual power ups that even exceed the alleged Asura. Oda taught us how to keep our expectations extensively high many times so we do well exceeding and venturing into wanking when it comes to Zoro because Oda is known for being exponentially impressive.