
What gives u the idea that he's reincarnated? I can say that he's just jealous. MC said that from the novel after luca got separated to her aunt he tries his best to earn his uncle's affection and of those others. Since here her aunt is affectionate to him he don't need another, we can say that he's satisfied with just her aunt.

because his behavior was too unusual for a child and for his book self, even if he was jealous there were no reason for him not to get excited in new places + he was behaving himself like he was already used to it all; + unusual knowledge for a poor child; + the situation gave me the feeling of the gag when person a thinks "oh he did that because he cares about me so much how can i repay him" and he did it because of other reasons
well turns out he really is........
good for him
is luca reincarnated??? or gust jealous?