Here's a mildly terrifying thought: Mathilde may end up as the standard of (Grey) Wizard behavior.
It's already the case where Kazador is concerned, and I can easily see it for the rest of the empire. The reason is pretty simple: For all her talents, sublety really isn't one of them. I'd say the Black College is probably the most subtle big thing she did, and that had her killing in the streets and depopulating a castle. I repeat, Killing the entirety of a castle is peak subtlety for Mathilde. Because at least the castle was still standing afterwards.
All the other Grey Wizards do important but dirty work, but their most spectacular feats (and most feats in general) are only ever known to a few. Meanwhile, Mathilde prances around leading armies, destroying strongholds, building doom towers, getting knighted and starting gambling parties. So if the average man hears "Grey Wizard", what will come to mind?
And really, I think the Grey Wizards would like it that way. It's much easier to be a sneaky bastard if nobody is expecting you to be one.