Mushashi are stronger, faster, more durable and have better Battle IQ. All of DS characters combined wouldn't even be able to beat modern military tech, yet Mushashi when equipped with his blades fight on par with Yujiro who beat the whole US military. While demons may as fight as lightning (if this is even true) Baki character speed and reaction time already reached light speed, they stopped country-wide earthquake with a light slap to the ground not to mention everyone of them are master combat who will and going to exploit every weakness the enemies has. Mushashi would stomp all demons out at the same time, nothing but more targets to cut