Harry is an unravelling on two legs, he laughs at prophecy, eats death curses for breakfast and defecates upon entropy curses. He is a destroyer and force of chaos in that he can avoid destiny and create new futures where none exist.
Example on Demonreach where he asks the GateKeeper to look at him again after he has stepped on the island, Harry has demolished the pre-ordained future replacing it with new previously unforeseen options my marrying Alfred. Clairvoyants and prophets must really, really hate Harry even if they haven’t met him yet (which is what normally happens) because he is a blind spot, all they can see is general details of war and bloodshed, no specifics. Chandler’s bonhomie to Harry is therefore forced and phoney.
I don't think what went down between Rashid and Harry are exactly as you say. When Rashid first scanned Harry, he had no clue of the connection Harry had made with the island. What he saw was Harry verses the Senior Council and it was a battle Harry was going to lose. There was nothing about Harry when he lacked a physical connect for him to see otherwise. When Harry stood upon the island, the connection became apparent and it was a game changer. How much of a one still remained unclear, Harry at that point had little knowledge of the implications of what he had done. If he had, the battle with Shaggy Skinwalker would have gone a lot different I think. In that year after
Cold Days Harry has learned a lot about the extent of his power on the island.
DM, it was prophesied that either Harry would die, or everyone would. That's not what happened.
That wasn't all of it though, The first part of it was if Harry sought the Shroud, he'd surely die.. That is why the Knights were trying to protect him, why Shiro sacrificed himself for Harry. However
the second part of the prophesy was, "If you do not, they all die. And the city with it."
Nic had used the Shroud to place a curse on Harry, which would have resulted in a massive epidemic in the city once he got hold of it. However Shiro took Harry's place, so Shiro got sick, as long as Nic had the Shroud after that the plague would continue to grow, but once Harry got it back from him, it would end. The only reason that there were no deaths beyond Shiro from the plague, is because Shiro took Harry's place, screwing up the curse.