Jin was a freestyler. The format has changed to writtens which is part of the reason why battlers these days are so crazy compared to the past. You have dudes preparing for months at a time for their opponent.
If he were to really make a come back, he'd have to put the freestyles on the back burner and really write. It'll never happen though because Jin's all about religion these days so he's not going to say some off the wall shyt that these other guys would have no problem saying.
Lastly... people like to shyt on Jin but I'd say out of all these battlers he's the one that made it out the most successful. He's caked up now. He went to Hong Kong, got treated like Hong Kong's justin beiber and ate WELL. He's not going to fukk around and get killed out here for 3-5 racks when he's already good with finances.
I'd take Jin's career over any of these battle rappers. At the end of the day, the majority of them gotta go home and get a 9-5 while Jin's chillin.