[ His doubt comes, of course. Wondering if Sanji's actually right, feeling like part of it was still just luck and not his own merit. But he wants to believe what Sanji is saying too, that he did it because of his own faith in himself. ]

... Yeah, yeah, I do. It wasn't just luck. It was more than that. It was me.

[ His voice wavers a little at the end there but he refuses to doubt so he straightens up and says it again. ]

I did it. 'Cuz I believed I could do it and I knew I could get it done.