User blog comment:PitchBlack696/Monster Hunter Portable 3rd/@comment-68.145.187.205-20101128003938/@comment-2040933-20101130002738

I was watching a stream of someone who has the game. Jinouga didn't appear at first(he was hunting a Bulldrome), but Jin was the warning monster. It is possible for Jin to appear early, just not in an exclusive quest.