Selective Channeling Question **Minor RotR Spoilers**

[Isonaroc]

So, just a random question I've been pondering. I've been running Rise of the Runelords and I find the feat choice for some of the NPCs to be...odd.
MINOR SPOILER

Spoiler:

The cultists in the Seven's Sawmill are all Rogue 2/Cleric 1. They all have Selective Channeling as a feat (which would be useful when fighting en masse), but they also all have a Cha of 8, which to my understanding makes them ineligible for the feat, and even if it didn't have a Cha 13 prerequisite they still couldn't actually use it.

So, is this bad design, or am I overlooking some sort of weird trick of the mechanics?

[Nefreet]

APs often have errors. Authors don't always have the same system mastery as Developers, and sometimes neither do the editors. Things fall through the cracks in between.