i did see people play Him and use Jinzo,. maybe they test it. but i was lucky to be test :D .
about Jinzo card . i remember they give it to people at a very begin at the game ,,, first month of the game or something i cant remember, not many people play the game at the beginning . or maybe im wrong
It's possible that there were cards in the BETA of the game that aren't available now (we know at least some of the level rewards were different). But I've been playing since the game was officially released in Australia (earlier than most of the world), and Jinzo has never been available in the actual game.