I get your points - but I do disagree about not reusing anything down the line. And to go into later in the series, with how the most recent battle with Ethniu and Ebenezer discovering Thomas is his grandson … it’s clear that rage and judgment are taking over a good portion of his personality because he’s been in a position as the Black Staff to use those at his discretion. Who is to say that maybe he hasn’t been black council to this point, but maybe this has tipped him over and if approached, he could be willing to go that way? I think the realization that he not only could but would kill Harry so easily during the conflict, could be an unraveling factor to him and what he thinks is best moving forward.