Extremely extremely rare instances that tend to have special reasons why that happened. But it's not normal and they aren't scalable. A liger or big bat Can Not typically take on a big creature like a buffalo one on one. 1. Just because you lose to someone. Doesn't mean you can't scale. Joe still causes actual harm, take hits, keep up with the fast?,and can canonically win against (which yes, it is Not game mechanic). It will have a permanent marking in his record if he wins a match against mac, and Mac will always have that loss. This is Championship Glass Joe. Aka, by the end of the game when he is fighting in the literal championship ring of world class boxers. He can win, it does effect their records, and we even see him with the belt if he wins the fight. Now of curse, End game Mac is much stronger then End game Joe, but that says more about Macs training to get better. But Joe still stands with him end game in the championship. That says leagues about how much better he would have had to get.
Plus, bonus point, every other fighter has a reason they typically beat him. They are than he is stronger, than he is bigger, or both. Now he faces something small and weaker than him.
2. Not going to happen. If this was something like a Class 1 vs Class 5, you could have more an argument. But Joe is Class 25. That thousands of times stronger. I myself could not knock over the worlds strongest guy if I hit him in his weak spot, because I'm still to weak. This is leagues of leagues different to where a Liger is not moving him not matter how hard he tries
He typically lost because he is weaker than them. That's why he lost. These guys tend to be giant against him. End game he can successfully win agaisnt Mac after he becomes champion. And a Liger does not do that all the time. That's a Rate occurance That always tends to have specific reason why it happened. One on one. Bigger animals win. A bear whoops a lion. A Walrus whoops a Polar Bear. An elephant whoops Liger.
Shaking doesn't mean he is a coward. That has no basis behind it. The shaking honestly could be their over dramatic "haha he is weak" being overplayed. Much like everything tends to be over the top. It's one of those "he is so weak he is shaking" things. And no. Regardless of him being full of himself, he still is brave enough t I stand in the arena, even if he has lost so many times, he continues on. He stood in the arena and fought with King Hippo and Sandman. Even if they whooped him, to openly step in an arena and fight with them says a lot on him. He hardly shows reason he is a coward. Being a little shaky doesn't mean coward. And by no means does that effect his skill and fighting. Even when he sees a star punch coming. He still will react and dodge it. So even if he was scared of it, doesn't stop him from reacting and fighting back
Yes. They did it with sheer power. Which guess what Glass Joe has over the Liger. A lot of power. Stronger, far tougher, and far far higher LS. Heck, not much stops him from pulling the same move done to the bull and sending them flying.
It's a trained fighter whos So much stronger LS wise the liger won't be able to budge them a single centimeter, Stronger AP wise, Much tougher, and smarter agaisnt a wild animal who's smaller, weaker, and far less intelligent than anyone Joe has fought before