Harry had his father first and foremost, Christmas Eve reminded Harry of this when he needed this most, at his lowest ebb. It is Malcolm I believe who prevented Harry from being a Destroyer, initially, re-inforced in Grave Peril by Michael, and later on at various times by Shiro, Sanya, Murphy, Butters and Father Forthill. Each of those people reminded him of his father, not physically, but because of what they are.
Mirror Harry diverged from Harry Prime in Grave Peril, he almost certainly broke with Michael, the Knights, Murphy and Father Forthill then, which is why that universe is doomed.
I wonder if Harry had had the opportunity to soulgaze Malcolm or view him through his third eye, what he would have seen? I like to think his father with a dove on each shoulder each flapping a single wing in perfect symmetry.