Many people seem to forget, the game is being released in Japan and they need their popular characters in it. Would they say "Nathan Drake? whos that? screw him since I dont know who he is!" probably not... stop being selfish and accept that the roster needs to be universally liked by people all round the world.
No. Yakuza does not, and should not be represented in this game.
why...? i agree with the above poster though, the game does need to be liked for the characters around the world, yakuza is popular in other countries and kazuma should be in