Theory #1 has possibilities. I just wish Joss would have been a little more explicit in canon about what, exactly, the resurrection spell did to give The First Evil the opportunity to build his army and attempt to retake Earth for demonkind. If Joss actually wanted to imply that when Buffy returned from being really, most sincerely dead she once again had the power to call a new Slayer upon her death, I wished he'd said it up front.
However, that certainly *could* be the answer. With both Buffy and Faith able to call Slayers upon their deaths, there would permanently be two active Slayers in the world at all times. And that may be enough of an imbalance in the mystical teeter-totter that governs this dimension to give The First Evil a toe-hold for his invasion plans.
I'll be honest and say I never liked the idea of Buffy and Faith sharing out their power to the Potentials. I understood that desperate times call for desperate measures, and they were to be Mankind's last bastion against the ravening hoards of Turok-Han, but I always thought that it had to have big consequences. I explored my beliefs of what those consequences could be in my story The Last Champion.
Anyway, the fact that ME never actually explained just exactly *what* Buffy's resurrection had to do with The First Evil's Big-Plan-'O-Doom is another reason why I think S7 missed its mark of being a great season.
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However, that certainly *could* be the answer. With both Buffy and Faith able to call Slayers upon their deaths, there would permanently be two active Slayers in the world at all times. And that may be enough of an imbalance in the mystical teeter-totter that governs this dimension to give The First Evil a toe-hold for his invasion plans.
I'll be honest and say I never liked the idea of Buffy and Faith sharing out their power to the Potentials. I understood that desperate times call for desperate measures, and they were to be Mankind's last bastion against the ravening hoards of Turok-Han, but I always thought that it had to have big consequences. I explored my beliefs of what those consequences could be in my story The Last Champion.
Anyway, the fact that ME never actually explained just exactly *what* Buffy's resurrection had to do with The First Evil's Big-Plan-'O-Doom is another reason why I think S7 missed its mark of being a great season.