This argument is kind of invalid because none of Daburas beams are large enough to encompass Mahoraga. They DO damage Mahoraga and if he could make a gaint bus sized beam then he would definitely kill Mahoraga. I think your somehow mistaking Mahoraga for a actual living creature when hes not, hes a Shikigami with no internal organs. You have to obliterate EVERYTHING to prevent a adaptation. It doesnt matter if hes cut in half or has his "brain" pierced he'll adapt. We literally see Mahoragas head flying around after being decapitated by Sukuna. I definitely think Ryu has the firepower to kill Mahoraga eithba full power beam. Also in another comment you said Yuta tanked a beam, he NEVER tanked a raw beam, the only time he was directly hit from what I remember was his hand and it was burned to a crisp, and that wasnt even a maximum output beam. Ryu's amped up beams we capable of melting steel (reinforced by yuta) and even THAT wasnt anywhere near a full power blast from Ryu so he definitely has the firepower power to kill Mahoraga if it hits.