User blog comment:Jopjopjop/Volume 18 Spoilers/@comment-66.225.161.184-20140626233427/@comment-4829046-20140627053432

Uh.... he got over that trauma officially. No point bringing it back. That's kind of a rule in shounen(and seinen too) where once you overcome the trauma gained from an antagonist, you don't get affected by it afterwards and if that person is revived, he/she is killed in the blink of an eye. The one point where they ruined this was in a stupid filler of Naruto Shippuden where the Sound Ninja 4 returned and made their respective opponents look like retards by reminding them of their battles and taking up full episodes to boot.