See, I'm wondering if there wasn't a Wilson (and possibly Clarke who wasn't in the CIA?) faction/opposition to Bush and/or Tenet that was from the outset trying to undercut the War on Terror.
Hard to say. The human mind being what it is, it's possible to know and yet not know something. I would guess that Tenet must have suspected something rancid was going on, or was maybe 99% sure it was going on, but he didn't want to confirm that last 1%, because it would have made him complicit. Nor did he want to root out the traitors, because they were doing political work he approved of.