The fact that Judai doesn’t feel interested in dueling during the graduation duels until someone actively seeks him out is so telling
Duels are his favorite thing. This is the boy who got hyped up and excited for life-threatening duels with universal stakes. Not wanting to duel
He says he’s tired and wants to relax, which is… all just cover for his depression
He ends up dueling but even that he doesn’t do excitedly. He duels Sorano and is sure to keep up a smile but there’s something that isn’t there in a duel with a stranger that there is in say, his duel with Asuka