Hey Tecmo, Is It Only For Xbox?

After finding out Dead Or Alive 4's possible secret of coming to another console, I decided to check out more on Tecmo's Xbox games. It seems very sporadic whether they put the "Only For Xbox" label on or not. One of Tecmo's games for the Xbox is Ninja Gaiden, which does not feature the "Only For Xbox" logo at the top, but it's been a while since the game has been released, and still no release of it on another system... The recent remake though, Ninja Gaiden Black for the Xbox does feature the "Only For Xbox" logo. Dead Or Alive 3 does not have the "Only For Xbox" Logo at the top, and it's been 4 years since the game has launched, and still no other console release, or even a remake. Even when the game changed boxart for the Platinum Hits, they still didn't add the "Only For Xbox" logo I believe. The 3rd and probably final DOA2 remake, Dead Or Alive Ultimate for the Xbox does feature the "Only For Xbox" logo at the top. I'm so confused...