Good suggestion! I do agree that it's a bit weird the way it links just to the user. That said, I'm not personally a huge fan of the links back to the original post, at least in that exact form. Ideally, I think the idea of having a mapping both ways such that the quoted posts should actually have links to the replies to that post. I think that'd be a more interesting way to do it, and allow for rapidly navigating a large thread.
Some food for thoughts there, thanks