Does anyone else see EB as the bad guy, he is the blackstaff after all he didn't get involved with helping Harry out tell he found out about the bloodline curse affecting him. I mean come on he's totally black council, he's just using the "gray council" to occupy harry and to weed out the good guys from the ones he can use.
First Post: I beleive in this theory myself, has Harry actually discussed the position of the Blackstaff or the Grey Council with ANYONE else on the White Council? From what I can remember, the only person he's ever talked to about it was EB. Since EB isn't above lieing to Harry, I put forth that there is no Grey Council and EB just convinced Harry that he was doing good when in fact he was helping the bad guys. It may be that there is no position of Blackstaff and EB is a warlock operating in secret from the White Council. You have to remember that in learning how the bloodline curse worked he not only was worried about protecting himself but he could have decided that if it were used to wipe out the Red Court(as it was) it would cause a massive amount of chaos just as the Black Council would want.
The first hole on this argument would be that Harry has soulgazed EB but since it didn't tell Harry anything about EB being the Blackstaff this could have been hidden as well. A soulgaze just shows the type of person he is, for all we know EB could be on the Black Council but truely beleive that he is doing good.
The second hole is the fact that Odin came to CI with the supposed "Grey Council" and he seemed to be acting on the side of good. Though as he has already shown in that meeting, Odin also like to keep things close to his chest and perhaps helped plan CI from the beginning as another member of the Black Council or a god who could see this happening as helping his overall end-game goals whatever they are.
They have said before that the reason why betrayal is so cursed is that it always comes from someone whom you would never suspect. Harry's mentor and grandfather being a bad guy would be a great way to twist the screws and really question himself and his lineage.
Also I beleive that Lea is not only his godmother but also his Grandmother with EB. Looking back it would make a kissing scene or two a little gross but it would also explain how mama Maggie was able to get Lea to protect Harry so much over the years. Margaret could have been a changeling who chose to be human and thus a wizard rather than becoming fae but was still Lea's daughter. Lea may have felt an obligation to protect her and further offspring because of this. [Edit: This could also explain how Margaret seemed to have a fairy's gift for the ways. Heck maybe she was a changeling who never chose but passed for human well enough for the White Council to never catch on. And perhaps it is an explanation for Harry's gift for listening, a deluted down fairy power from his grandma.] The whole mythology and legend behind Lea was how she would seduce mortal men and EB said himself that sometimes you gotta make deals you wouldn't normally make. I wouldn't put it past him to get a child on Lea if he needed help bad enough.
Edit:
Or heck if I'm wrong about Lea, maybe Grandma Mabs?(scratch that, them on the stone table in Changes makes this too disturbing) I just don't see EB shacking up with a mortal woman back in the day, it would be too bland and not fit as awesomely in the Dresden universe.