Christmas Eve shows Harry still considers himself to be a Wizard of the White Council, so we can presume there is still a White Council and Harry is part of it, he is deprecating the fact that Mouse has to help him. This is how to defeat Harry in a Duel, choose assembly of a children’s bicycle under Skill.
This does not mean other characters are on the White Council i.e. They died. I think both the Merlin and Luccio (and Christos) are for the chop, replaced by Eb and Harry in time for Battlefield when they are needed.
There is one other Wizard level talent running around, under the radar, Mortimer Lindquist according to Uriel who should know. Granted he pretty much set his powers aside at one point, and his powers are strongest in Ectomancy, but off the fly in Dead Beat, he does a rather nifty spell allowing for necromancy cold spots to be identified. He isn’t a strong one trick pony like Binder, he has a broader talent.