I liked the parallel with PoA here, re: Neville overhearing that conversation. I also liked how candid he was with Harry about it.
There is definitely an irony to Neville imagining the "could have been" when of course we know canon wasn't anything like that.
Will Ron come into play more once they go to Hogwarts? Is Harry close with Ron at this point, but Neville less so (hence why they don't seem to interact much)? Just curious.