Common misconsception about mahoraga: he can only adapt to CT based attacks
People keep saying this when that obviously isnt the case. He can adapt to any and all phenonema, including fighting styles. here is the proof:
So if he adapted to sukuna's fighting style (AKA faking slashes to confuse him) then he can clearly adapt to any and all phenonema, which makes mahoraga even more OP now that you think about it. If megumi had tamed him he could have kept adapting mahoraga to many stuff overtime and made him even more stronger.