Very few Xbox games are compatible on the XBone (I think only 13 so far?). I doubt that they're a priority. DOA4 (which was partially promoted by Microsoft) & DOA5 are not backwards compatible on the XBone either. They're just not a priority at the moment for backwards compatibility.
If it matters DOA2U & DOA3 are playable on the Xbox 360.
If it matters DOA2U & DOA3 are playable on the Xbox 360.
Heck, even Soul Calibur 1 is available on the Xbox Live Arcade.