So, let me try to make an analysis of how I understand the situation.
We are essentially buying a ranger force. Their function is different from SI. SI is for dealing with mundane-noticeable supernatural crime. As we buff them up, they'll probably be able to expand to all supernatural crimes that deal with civilians. Stuff like theft using magic, magic rape, etc. Marcone's force is more for dealing with hauntings, minor NeverNever pests, and for extrajudicial executions we cannot expect Murphy to do, and Harry doesn't have time to do because he's accompanying us and fistfighting Red King or stopping USA from being blown up, or reality from ending.
Marcone wants, most of all, to have autonomy and security for himself and his people. From this perspective, I think plan Helping Each Other V2 is actually quite good, better than when I originally wrote V1 and then deleted it:
1) IDU gives Marcone and his people means to fight low level supernatural threats on more or less equal footing. It also disqualifies him from exalting, which is great. And finally, we hold the leash by being able to revoke IDU at will, which he wouldn't know.
And if you can't make profit from your superpowers and immortality / longevity, you are not very bright. And Marcone is bright.
It also makes him and his people Creatures of Darkness, granting us social bonuses against him. I'm not sure if he'll personally go for it, but it allows us to subvert parts of his forces over time.
2) Medicine trading, which, by itself, would be a very hard sell, because it makes him reliant on us, is easier to sell within the wholeness of this plan. It gives him a huge revenue stream, while using the infrastructure he already has. It competes with drug trafficking, and, if Marcone is smart, he'll invest in medical research. And some of his IDU'd people might develop relevant abilities.
3) Splendors. We are basically solving all the life's issues with splendors. A 2 dot splendor (which will cost as a 1 dot splendor, and something Marcone should be able to supply) will be able to provide Resources 2 for a week, which would take care of wages for his people.
By showing him the Sanctuary, we also realign his view of us.
So, yeah, on further thought I am satisfied with the plan as it is.
ETE he gets put in jail for life inside of a week. Again their nothing he has they we cannot do massively better in every way. We don't need criminal we can start our opperations with people the police don't want to put behind bars. That without even tappping the FFC. The advantage of being rich is the manpower you can hire, to do things for you. Security, transportation, distribution, marketing, sells. All can be done easier, and faster, by legal people we can hire, then we use the profits to buy out companies entirely to vertically integrate.
Why would we waste him like this, if we can instead make use of him, without having to expend resources?