The elephant is valid. And it isn't even a normal elephant, but some sort of prehistoric super elephant that an entire army couldn't stop with missiles and tanks.
The Earthquake one is generally considered an outlier, even for Yujiro, because he's never done anything close to it since.
Either way he's king of the Baki-verse. The entire combined militaries of major nations such as America bend the knee, because they can't beat him in open warfare.
He's powerful enough where you can't say for certain overpowered characters like Vash the Stampede, Master Roshie, or Might Guy would win for sure.
Kenshiro would own him though.