HEIHACHI MISHIMA Has his own fighting game so I dont think you should have used the "he already has his own fighting game" argument
Tekken has also been a major part of Playstation's history for over 18 years and Heihachi's been in every Tekken game. He has a hell of a lot more to do with Playstation than some overrated manga character, who just happens to have been in a few games.
If I remember correctly, Tekkens 1-5 were console exclusive to Sony. Also, we actually have an argument.
They were and the Tekken series was built on technology created by Sony. (Thats why it was exclusive) So theres another MAJOR plus for Tekken.