You guys also should keep in mind, as I said before, that Pclips has stated that he doesn't want an overly complex story and there are no huge twisted surprises awaiting us. Some authors like to trick their readers but that is not a goal for this one. Making Wanda the Predicamancer would be one of those "pulling a fast one" tricks that he said he did not want to pull.

FAQ was discovered because Stanly had a Lookmancer who could see all the cities. No betrayal nessicary.

The Predicamancer is almost certainly dead now. So whatever she can do, Stanly somehow prevented it from affecting his plans and her ability to disrupt those plans is the only knowable reason that she is the only caster that died during the coup. When I look at the flashback scene on Stanly's return it certainly looks like Wanda is on the right side green dwagon. Plus, he only had 3 casters before FAQ. Hardly "a number" of casters.

Wanda is probably capable of different magics simply because Croakamancy was not a favored casting type but that doesn't change her primary function. Instead of all this talk about how Wanda is trying to rule Gobwin Knob, the simpler reason is that Stanly lets her indulge in Croakamancy, whereas FAQ never did.