But I also think Lorroakan had too many personal details not to have word from Mystra. Fits with Mystra's past behavior trying to warn followers away from doing certain things (IIRC she did some of this after the fall of Netheril
Both Midnight-Mystra and Kelemvor were put on trial and she was forbidden from cutting evil mortals off from the weave. There's also a practical implication - anyone who is cut off from the weave can use the shadow weave instead.
Mystra is like a sysadmin who doesn't care if someone hosts silkroad 2.0 on their machine but she does care if people start to hack the server and threaten to bring everything down. She's especially lenient towards evil mages who create interesting new spells. Larloch lived for centuries, he was as evil as the day was long and Mystra never rescinded his chosen of Mystryl status.
It just happens that Gale's Hubris led him to do the one thing she couldn't ignore - brought forth a threat that could destroy all magic.
