I previously posted this in another thread but it got zero response, likely because everyone thought I was crazy:

Mavra.  She thwarts Cowl’s efforts to get the Word of Kemmler and had had it for years, yet never attempted the Darkhallow.  She teaches Bianca sorcery, yes, but she also probably helped coax Bianca into starting the War that ultimately wiped out the Reds. Plus, she may have been behind the poisoning of Susan, thus bringing about the birth of Maggie and the plan to use the Blood Curse.  Plus she was conspicuously absent from her own lair when Harry raided it, perhaps because she got a tip from her old friend McCoy? She’s playing the long game to eliminate her rivals.

Don’t obfuscate this. JB has given up on us. It is what it is. The bs anthologies are nothing more than an (poor) attempt to keep readers happy. Write a novel if you care so much about your fans. I show up to work everyday just like you.

I liked him using the Chinese sword in Changes... kinda fits with his inner geek and fighting style.

I've always just assumed that Mac is The White God, taking a back seat while reality plays itself out. He's always wearing a white shirt, using a white rag.  Harry even desribed Mac's beer as "God's own beer" and the guy has the respect of Odin, Mab, and everyone else.  The only beings who have dared defy him so far are The Outsiders.