Baki chars have such ridiculous durability a guy had all his ribs broken, both knees, then proceeded to jump out of a multistory building in the same night on those broken knees, stare down > 1000 people and break them morally and nearly murder another guy fairly casually by dropping from an upside down rollercoaster and holding onto a lighter tied to the track.
Another one got shot in the head with a sniper, recovered mostly within a day, then tanked point blank machine gun shots after literally punching a wall to death.
The former lost to a guy who couldn't even hurt Pickle literally at all (who Baki broke a tooth from and gave a fairly good fight before losing, but never went demon back on and still decided to fight with just force despite this), the latter got casually 1 shot by Yujiro literally not even trying. I think he got slapped, too, not even punched, but could be remembering wrong.
This was after the baki v yujiro fight where Baki was used as a living wash cloth/nunchaku combo and whipped through a car and made a miniture samuair in the middle of being whipped through the car.
Baki's durability is multiple levels above a guy who got shot and barely cared. Who himself is miles above a guy who walked on completely shattered knees.
Baki also breaks the sound barrier with his go-to IC attack and carries enough force to knock down multiple walls in his way without even slowing down (whereas even the superman syndrome guy in Kengan just makes notably large cracks in 'a' wall).
The actual feats of Baki's verse and Baki himself are miles above Kengan.
A lot of the bullshit Ohma's fighting style lets him do is just thing low-tier baki characters do by default just because its Baki. Or just needlesly fancy named ways to do really basic things like 'literally just grabbing them'.
The main thing he has for him is demonsbane and the argument will likely just devolve into trying to figure out the theoretical limit of what that can block, how much he can spam it and if he just instantly wins as a result. The last part is 'no'. As noted, Baki got slapped through a car by his dad and has taken hits from both Pickle and his dad with demon back active (ie yujiro had it on) and took tons to actually lose or get to the point he had to use his spirit to fight because his body couldn't move. Those are both physically stronger than him, and demon back yujiro much more than base non-demon back baki. He's nowhere near strong enough to 1 shot himself. He's also not, ic, turning on demon back on a whim. He's nowhere near as reliant on it as yujiro (who does it in almost every fight).
Ohma is insanely reliant on his own ******** anime powerup, because he spends the majority of asura being an abjectly terrible fighter who can't win without stupid gimmicks, so he will use it, almost instantly, like he always does. He even used it v mooks lmao. And then if he doesn't win incredibly fast he loses. Advance is suicide. Ohma literally already killed himself this way before and despite 'fixing' whatever issues tiger niko taught him wrong with it, he still says he can't activate it for more than 'seconds' without causing significant self-damage.
He's not taking down Baki fast.
And this is Baki without using demonback. If he uses it its even more unlikely for him to win.
Way I see it he turns on advance super quick in the fight, like always. Demonsbanes base Baki. Which doesn't actually do that much when baki's durability is so far above his actual damage. Then Baki's only real way to lose is to repeatedly fail to beat Demonsbane in rapid enough succession he kills himself before Ohma does. Which is IC for Baki to do.
So the question goes back to: How infallible is demonsbane? Its written as 'countering literally anything from any position'. But to act like it abolutely can do this just because the narration says so is a fallacy. Its not been proven to do so. Its been proven to do very little. He loses the very next fight he has after remembering how to do demonsbane and spends half the next series 'dead'.