Daisuke, IMO, is the most artistically talented skater in Japan now. Not only that, he is one of the top 3 most artistic skaters of all time.
Technically, I'm not sure if he will regain a stable quad again. He is trying now, and time will tell.
Kozu is not so expressive. However, I forget which performance it was but I did find myself crying once when I saw him perform this season's LP because it was so quietly intense. I think Kozu has had difficulties this season because he was trying to improve his quad jump. He changed his entry technique, successfully I might add, and it's gotten solid. I really like Kozu alot.
I don't see Hanyu as an artist per se but he's just very, very appealing. He may one day become Japan's no. 1 but he still needs to improve on his skating skills. I hope he does!