"Kakistos," Denn bowed down to his master. "I bring news of the Slayers."
"Slayers!" Kakistos growled, "Has the spell been broken?"
"Not exactly. The council has intervened. They --"
Kakistos laughed. "The council! Mindless twerps. How can they stand against my power?"
"After searching years for the 'lost Slayer', they discovered our spell. They have begun a plan to restore the Slayer lineage. They are attempting to break the Slayers from their traps, return them to who they were."

Kakistos sat back in his chair and thought about this for a while.

"Send someone to kill them. If it took the Watchers this long to find them, they'll take this long again. Kill them and re-cast the spell on the next one."

Denn hesitated. He thought the Watcher's Council weren't as stupid as they looked. Each time they had to search for the slayer they would get better at it. Normally the Slayers don't know about who they are, but the Council can find them with seers and the like. Kakistos' minions had cast a spell to take the Slayers out of their lives and into another. It meant that the Council had a harder time of finding them for one, but each new life had been tailored to suit each slayer, and limit their potential. Faith had been given a perfect life, including a new childhood, and a family of her own, destroying her anger and passion for the fight. Buffy had just been given something else to consume her life. She had fought for her friends and family, so they had been taken away from her. But Kakistos wasn't stupid. He didn't want Buffy to be unhappy. If Buffy was unhappy he could have just been stuck with another Faith. Buffy becoming a workaholic was the perfect solution.

If the council was smart enough to figure that out, they weren't stupid.

But neither was Denn. So he simply bowed and left off to kill the slayers. Hell, it wasn't HIS problem.