
"I beat Isagi once, he's not gonna be better than me again." ╮( ̄▽ ̄)╭

i dont think its that i think it wasnt exactly isagi he wanted to defeat but the feeling of frustration isagi made him feel. He defeated that feeling with that amazing 5 juggling volley goal and now he cant seem to find a new goal to aim towards that hes as passionate about.
He knows isagi is going further but he cant seem to lock in because he lacks passion and needs to find it again. I dont think the passion he has for him and reos dream is enough
If Kunigami came back, nagi prob will too. ╮( ̄▽ ̄)╭
That said, I like that they addressed Nagi's new predicament. Ever since he "beat" Isagi that one time he has been discouraged and uninterested in doing goals etc aka he's a bit out of place. The whole BL project is to create an egotistic striker but so far and autho he has been great on field he does not strive to make goals at all.