https://wordof.jim-butcher.com/index.php/word-of-jim-woj-compilation/woj-on-vampires/
Unverified WoJ from the 2011 Naperville signing:
‘Are there White Court vampire wizards?’
Yes, there are. Thomas is middle-of-the-road in power and [ed: think I’m remembering this correctly] the strongest don’t get as strong as mortal wizards [/ed], but they can pull off some strong tricks with their Hunger.
2015 Grid Daily interview
... It would also imply that elder White Court vampires may know that practitioners are the way to prop their numbers- and therefore why the Skavis plan was never tried before, it'd be suicide.
That seems odd, in that apparently
Lara was behind this move, and she presumably has acccess to everything pere Raith knows, and to the (in)famous Raith library.
OTOH, I wouldn't put it past her to set it up with the intention it would fail, knowing that when the "herd-cull" got to Chicago (and involved Thomas & Harry) the plan would be ended with extreme prejudice (and (with
any luck whatsoever!) ancillary damage to houses Skavis, Malvora, & any others among her whamp enemies). So, maybe not so odd...
Maybe. It seems like a horribly existential risk to take, since (once the plot was launched) her ability to guide it was minimal; what if they'd moved to Europe, or stayed bi-coastal & avoided the midwest, etc? What if they hadn't gotten sloppy-enough to get noticed, just blew through Chi-town before Dresden (or Thomas) picked up the scent? Lara being suicidal seems
really out of character!