If Libby and Rove tell totally consistent stories then the folks who are inconsistent with either one of them are in a bit of difficulty.
Miller was needed to validate Libby's story, for example, because that puts the nail in Cooper's coffin, and with that, certain statements made internally to the CIA (without external circulation) become highly suspect.
With Wilson not being a CIA employee, it would be Plame, or someone closely associated with her, who is the source of the inconsistencies that grabbed Fitzgerald's attention. That individual may well have "outed" a different undercover agent none of us know about ~ e.g., the person who provided the holographic copy of the papers on file in Niger supposedly showing Saddam Hussein's interest in yellowcake.
It's absolutely amazing so few folks have ever had any interest in the only spy in the game.
Interesting conjectures.
Since you raise the issue of Plame's responsibility (and it would seem that the whole thing had to have started either with Plame or Wilson), what about other players in the CIA?
Maybe it's beyond Fitzgerald's brief. But who accepted Plame's suggestion that Wilson should be used by the CIA? Who authorized his junket? I doubt whether Plame had the authority to do more than suggest it. Were these higher ups in the CIA involved in the early planning of this conspiracy? Maybe Tenet himself?
Usually the CIA is insulated from such investigations, so I guess we may never know.