I appear to have been unclear about what I meant here--sorry. I meant: do we have any evidence that Michael was right/do we know what evidence Michael had to base this claim on.
True, but Harry still had his magic then, so it doesn't speak to that. If anything, this is evidence for the fact that the shadow can draw some measure of strength from the Fallen in its coin, even when the host hasn't accepted the coin.
Not really as to your first paragraph. The shadow has to draw power from something. If it can survive only on a wizard's power, then it would be believable that Michael believed that Harry would have to set aside his power. I don't buy it, but it's something.
Why would Nic go to the trouble of destroying the church's records if not to do exactly this. Perhaps it has happened in the past and Nic wanted to keep it secret in order to make someone like Michael think it was hopeless.
I cannot think of another reason than to prevent the exposure of a potential weakness.
Maybe a Knight found his weakness? Didn't Michael say that Nicodemus destroys the Church's records of Nicodemus?
Also, Lash confirms that no one has ever resisted the shadow of a fallen for as long as Harry. Of course, she could be lying. It's what she does.
Your number three.Harry didn't rid himself of the Shadow. So Micheal was right.
Michael said Harry
could rid himself of the shadow by giving up his magic. Then Michael said no one
has rid themselves of a shadow except by doing something different. Why did Michael say the first thing if the second thing was true? Now the two statements are not mutually exclusive, but what caused Michael to say something he had no historical evidence for?
One could say Harry got rid of the shadow by resisting it and by shaping and convincing it to do the right thing.
Perhaps Michael was confounding black magic taint with shadow taint. Then he hit the books and realized his mistake.
The statement that Harry could set his power aside and be free of the shadow and that the only way to rid yourself of a shadow is by taking up a coin and then giving it up don't sit well together. They're about as close to being mutually exclusive as anything can get without actually being mutually exclusive.
The simplest explanation was that Michael lied to Harry in
Proven Guilty because he believed what he later said in
Small Favor. If he told Harry he had to take up the coin to rid himself of the shadow, that would be one more thing tempting him to take up the coin. Michael knows Harry better than we will ever know anyone irl. He has seen his soul. Michael could have thought that Harry's best chance of not going to hell was living for centuries with the shadow because Harry would have been too stubborn to ever take up the coin.
I still think Michael was wrong in
Proven Guilty and then wrong again in
Small Favor. I don't think he was lying.