But if you weaken everyone you achieve nothing, their relative strengts stay the same. To create real chaos you need to strengthen a somewhat weaker aggressive party and weaken the powers that are so someone sees a chance and goes for it.
OK, I was unclear there. I reckon Cowl is all about weakening everyone else in order to make life easier for the Outsiders.
The rest of what you are saying, I say both yes and no to. In that I think the method Cowl is using to get everyone beaten down includes sometimes throwing balances off (as between the White Council's hammering in DB and the Red Court's in PG) but mostly dragging people into wars that benefit neither side (as in GP, and as attempted in WN).
Not compared to the white council but the real target has always been Winter.
I don't agree with you there. Winter being the ones who are up front guarding the Outer Gates at the moment makes them a necessary target, but far from the only important one.
To disengage for what? They went completely crazy at the end of changes.
I don't agree with you there either. Harry finds the notion that evil is chaotic and crazy and self-destructive very comforting, and he projects it all over the place, which leaves him a big blindspot to evil that is actually organised and out-thinking him but passes itself off as chaotic etc. (Like the Joker almost all the way through
Dark Knight.)
The Red Court isn't crazy, by all the evidence up to and including Changes. It is deeply divided over whether war with the White Council in the current timeframe is a good idea. Harry is looking at the outcomes of a shifting political balance between those in the Red Court who think that outside sorcerous aid can make the war winnable to them at this point (Arianna) and those who see that they can't win the war at this point (Ortega in DM, the Red King in Changes), and thinks he's seeing one commander who is loopy. The Red King rather neatly plays Harry to get rid of Arianna.
He probably tried to encourage the Fomor to take a more active role as well.
I strongly suspect the death of the Red Court will turn out very much a net loss for the defense of reality. I like the notion (not originally mine) that Chichen Itza is such a nexus of power because, like Demonreach, there is something really scary buried under there, and I would not be at all surprised if reconstituting the Red Court from the survivors (the ones in the Erlking's basement, and, if I am right, Ortega) is a vital part of the final battle.
So why did Odin and Uriel join Mab?
I've analysed that at some length, and I think my argument still stands; it's in the reference collection at
http://www.jimbutcheronline.com/bb/index.php/topic,40670.0.html