Free Step Dodge

That doesn't depends on the overlap of the fans of both games.... Obviously Ninja Gaiden and DoA fans have a huge overlap thanks to the Cannon Ninja Gaiden Universe.

So the Question is how fan DoA fans are also Sengoku Musou fans ?

It's possibru. A lot of people are not aware of the warriors series so SW4 Empires or even SW4/SW4-II could potentially increase in sales since people may be interested in the game where she came from. Then again, the VFs are in this game, but VF5:FS is still kinda dead...

LoL I think When VF6 Comes out it will do well thanks to DoA5 Keeping that dream alive while fans waited.

Plus I bought VF5 because of DoA.