Here is another theory you might enjoy reading!

"I've heard many names from the series of male characters who are half-bloods (or not); Hagrid, Seamus Finnigan, Remus Lupin, Dean Thomas, Snape (Come one people!),… etc. So who is the HPB? In my opinion (this is just speculation), it is Dean Thomas."

This one is also very interesting, and doesn't take long to read, so just take sometime to read it, and then post what you think!

Read it here