I don't think Lea can be standing in for Mab while Mab handles the Gates in disguise as Lea, though it's a great idea.
She says that "my second" informed her about the Gate. Lea is Mab's second, but if Mab and Lea had swapped identities, I think the Faerie inability to lie would keep Lea from describing Mab that way. She would have had to say something like "our commander on site"...
Now maybe Lea has her own "second" but... Also, Corb seems to have actually angered Mab with references to her mortal life.
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Molly certainly. Sarissa probably. Titania no.
Yeah, I think Titania will continue to do nothing useful.
Molly will surely be involved, and I guess her "personal guard" or "retinue" or whatever, though the rest of Winter (except Harry) is occupied at the Gates.
It is undermine the defence of the gates, by forcing a split in Mab’s attention.
I don't know. I kind of think that Ethniu is using the Outsider attack to distract Winter from her plans, rather than vice versa.
But I guess the larger question is... given that Mab's Purpose is defense of reality against the Outside, how do the Accords benefit that? And why are they needed "now" - it seems like the Accords are a relatively recent innovation?