See, I figure Cristo is just an idiot, and PT/BG reinforced that idea to me. Idk he just seems suck up and too into posturing. He's just in the 'game' of politics. I've always thought Langtry was the other traitor. For various reasons, the look he gave Peabody when Harry outted him being the most prominent. That shark look, idk. It reminded me more of him looking at fellow predator whose been injured during a feeding frenzy. He knows Peabody's been had and doesn't want him to mess up and expose him too. He's ready to take him down rather than being bit too.
I've also always had this idea the Merlin, being a titled position and not a name, might have a mantle attached to it, and that mantle might be corrupted already.
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PT/BG also did nothing to lessen my opinion. Most important battle in years and the Merlin is nowhere to be seen? What really could have been going on that half the senior council was absent? Especially if everyone really wanted the eye.
Can the Mantle's actually be corrupted? I am not so certain that the Merlin has one either...what makes you say that? It's possible Langtry was doing a Palpatine in Revenge of the Sith, and letting Peabody (his servant) take the fall. But why then, would the Merlin also have been targeted and possibly influenced by the psychic ink? Seems a bit odd. The ink also explains so of his poor behaviour - encouraging his defensive mindset and making him overly cautious etc.
To be fair the the Merlin and the rest of the White Council, the Fomor took
everyone by surprise. As far as I can see not one person was prepared or expecting what happened in Battle Ground. Sure, most of them knew the Fomor were treacherous. But they didn't expect a full-scale invasion. A destruction of the status quo. I suspect if they had known what was coming, the White Council might have taken appropriate counter-measures, along with the other accorded nations depending on who informed whom. The Eye didn't attract them, it kept them on the field. Most of those who fought were already in Chicago.
If the Turn Coat plan had been successful, it would have seen LaFortier dead, Luccio executed, Langtry embarrassed, and Morgan discredited, Harry implicated for his relationship with Luccio (which would be conveniently revealed), Cristos the rising star, and Peabody still in place to manipulate things.
Then, Cristos could accept the peace summit from Arianna, look like he's pushing for peace to save wizard lives, and when things fall apart with Listens sick and the other Seniors missing, he could take control just like he did. If the curse had succeeded, then Harry and Eb would be dead, Harry could be blamed for the illness that swept through Edinburgh after his visit, Listens might be dead, the missing Seniors would have been painted as cowards that hid in the Council's time of need, and Cristos would be the leader of the Council in one way or the other.
It's a quick rise to power for Cristos, who could completely control the Council with Peabody's ink.
Instead, things fall apart, he isn't the undisputed champion of the Council, and he has to change tactics. He has to play nice with the other Seniors, and remain involved in things. He's shown himself to be brave in Changes, so now he's got to keep up appearances. I have no doubt Eb is suspicious of him, so he's sticking close, and Cristos had no choice but to show up for the talks for numerous reasons. And once he's there, he's got to fight for real to keep himself alive and keep up appearances.
When you put it like that it does look very bad for Cristos. At the very least it makes him look like he's being manipulated. But playing devil's advocate here there is an alternate explanation.
He also could just be an idiot. A sort-of well meaning idiot ending up running the Council just when it needs to be at its strongest, and ends up being at its weakest. That's potentially more dangerous to the longevity of the Council.
Let's say Cristos is a power hungry, pompous buffoon. He wants to be the big man. So someone (Black Council perhaps) feeds his ego and helps put him in place to be promoted to SC once a SC member is removed...and arranges that very thing. Then Cristos thinks he can "save" the Council from their horrible war and tries to negotiate an armistice with the Vampires etc. Which would have made things worse for the Council but he believes he is the hero doing the right thing.
However, I am not saying any of the above is the case - merely that's an alternative argument. One thing that stands out is that Cristos apparently had loyalists kidnap and detain most of the Wardens. Forty percent of the senior most wardens. This is in Changes and apparently takes place after Harry leaves Edinburgh. Ramirez and Luccio are both captured. This is interesting I think, especially as Ramirez undergoes a slight behaviour change. He also becomes more loyal to the Council than before.
I think it's a good point you mention the McCoy is always near Cristos. The White Council's hitman seems to now always be right next to Cristos. This is as far back as Changes such as when Cristos and McCoy are the only two Senior Council members on stage with Arianna. This could be interpreted a few ways. Either they are now inseparable best friends and joined at the hip, or that it's all just coincidence they are together, or that McCoy has been assigned to watch the most disturbing threat on the Council and execute him should he prove to be the danger they think he is.
The third option could well be the most likely. I would be a little disappointed if Cristos was Cowl, although I do see how it's very possible. Mostly because Cristos got wrecked in Battle Ground and I would expect a wizard of Cowl's level to be much more threatening. However, I could also see that Cristos might just be on Cowl's team. This might lend weight to the Cowl is Simon theory as they're both possibly part of the same faction.
Maybe he's just a pawn, witting or otherwise. Or maybe he's manipulated things to put himself in power over all wizards in order to change the nature of the Council itself from the top down, and bring about that corruption he mentioned in Dead Beat first-hand.
Assuming Cristos is Cowl of course. Cowl seemed to want to end the Council, not change it. But there are many paths to victory after all.