Couple thoughts on this. It seems that a lot of people here believe Marcone to be taken over. After reading Even Hand, I really don't think he will. Marcone knows lawyer talk. He is a meticulous, intelligent, and cunning mind. I am of the opinion that he's of the same stuff as Harry and will keep control.
Harry never took the coin, he had the shadow and one of the reasons he could resist that temptation is that he could change the shadow as well.
The other reason was that he ultimately did not want the coin.
Marcone has the coin. He accepted it with his free will. He wants to keep it. Theoretically he can resist it but practically that will be not that likely. It will become more and more difficult and he will grow dependent on it. The coin will influence him and he will I’ll. e changed as a result. No big change at once but after some time his goals will align with the fallen and he will be their tool. This can take some time but the idea that Harry could take up Lasciel’s coin and stay in control for 500 years is not very likely. It is just a matter of time. Only throwing away the coin will reverse this process.
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And as far the KotC going after him. Until Marcone does something to make them take notice, like use the coin to get his way in mundane situations, I think the Knights don't have a reason to interfere.
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They need a reason for that. They did not go after Harry when he had the coin.
I do like Jim's smack down of all the people who believed Marcone to take up the last sword. It's not a complete no it can't happen, but if Marcone chose to pick up the coin and wasn't seduced or tricked like Sanya, I don't think he's a candidate anymore.