How would you guys feel if budha lose ,i dont belive it due to story wise-plot,but what if
I would feel it's stupider than having Adam lost, simply because it serves no purpose to the story. At least Adam's loss rallied all the humans together. What would Buddha's loss accomplish? Enlightenment is a fraud thanks to some dude from hell?
Besides, all 3 of the Divinity who won so far gained genuine respect toward humanity in their victory. Hajun will just laugh his ass off if he can defeat Buddha, because nothing will change for him (Hajun is kinda like Poseidon in this regard).
Also, as far as underworld Divinity are concerned, we already got Anubis on the roster and now we got Hades, too. And we know now that Hajun doesn't play nice in Helfheim.
And at least if Buddha wins, he can find sanctuary alongside the humans (if the Gods don't jump him first post-match). But if Hajun wins? Gods wouldn't take him in cause he is not one of them and would certainly consider him too dangerous to be let live. After all, Hajun just freely admitted he killed Zerofuku a long time ago...which was a stupid move from him, cause he wasn't a top God like Zeus or Poseidon who could still live freely among the Divinity even after killing their fellow Gods.
Meanwhile, humanity will harbor a deep hatred toward him since he pushes them closer to extinction.
Hajun's only prospect is hanging out with Beelzebub (fellow demons), who already got what he wanted from Hajun on ch. 51 (so, not even a friend to Hajun). It's gonna be Gods and Humans vs Hajun, which is a prospect I don't think Hajun would appreciate. Even if Hajun got help Beel, it's still Hajun and Beel vs everyone else, which isn't a prospect Beel would appreciate.
In short, having Buddha lost to Hajun for whatever reason is about as smart as making a failure of a character like Momoron a major figure in your story post-TS. Buddha might not survive the story eventually, but he still should send Hajun packing.