Other varieties of divination exist, as does mundane investigation.
You're not exactly wrong on Lictor, but I think that the correct decision depends on if we prioritize stopping him or following his leads.
We can and should do both, but we have to choose which one takes precedence and that will make the other harder for us. We also don't have infinite time to work with here. Letting the fey police their own in the initial sweep and then following what we can get from his coworkers and our existing knowledge would immediately disrupt his current activities and still leave us a way to offset the lost foci, so I'm leaning toward that approach.
As to Rodney; I can see where you're coming from, though I don't precisely agree with the conclusions. I'm struggling with this one because I see saving him as taking on a lot of risk for little reward on behalf of a man who made this situation for himself.
Ethically I personally am not too broken up about being responsible for what happens to him. Rodney made his choices for selfish reasons, and if he changed his behavior it would be to keep himself alive and not because he suddenly cared about the consequences of his actions for other people.
Practically, I don't think he represents much value to us and does represent a lot of risk. He's not a CoD, and I doubt we can just wave away his gambling problem without consequences with our current abilities*. He isn't trustworthy and his value to us is mostly related to the investigation. If we cant use him to feed bad data to his backers then he's just as valuable dead as alive.
I'm also concerned about sparking something we aren't ready for with Marcone. Sure we're an exalt, but he's not a pushover and he's very entrenched. Eventually we can handle that, but certainly not right now.
There's also the consequences of victory if we do win. Marcone is like the city's gut microbes; he keeps worse stuff from moving into his niche and the chaos to a minimum.
The fact that he has standards doesn't justify what he does, and I'm not saying we should cost up to him as a necessary evil. It does mean some care is warranted.
Personally I want Molly to displace him and take over as underlord of the city, but I don't want to try, or imply we're thinking about it, until we can take a real shot at winning.
Ideally I'd like to live up to this meme for our long term plots:
So for all those reasons it doesn't really seem worth it to me to actually play games to save Rodney from himself.
However, the more I think about this the less certain I am
Molly would measure lives like that.
* I have other character issues with this, but I don't want to make this post even longer than it already is.