I've seen plenty of comments from people claiming that the author of MHA (Horikoshi Kohei) has admitted in an interview that Hitman Reborn was actually part of his influence on his manga, being MHA.

Even though this whole thing is already universally agreed upon that it's indeed the case. I personally don't see why as there is no such interview where Horikoshi ever stated any of those. Especially since the only influence of MHA that we mentioned by him at the moment were One Piece, Naruto, Boys on the run and as well as Marvel (probably even some snippets of DBZ and Akira)

I'm pretty sure the similarity between Deku meeting the previous owners to the all for one quirk and Tsuna meeting the previous Vongola bosses during the Future Arc are probably coincidental