Seems like I’m popping in and out with these threads. Call me a grasshopper 
Anyway.
1. I’m gonna stick to my theory of Rabbit being Cagliostro and I’ll say he never had anything to do with Silver or Wool bar observing them from above like a magpie. He’s more or less of a butterfly or a defective cog that goes against the rest of the scheme, driven by his own agenda. Deirdre’s posts and her father’s messages clearly proved you don’t have to belong to either of the groups to practice magiq. It might be different or more difficult but it also leads to some unrestrained possibilities while barring you from other options. So Cagliostro might have had some broader idea of how things work but I’d still believe he’d never actually, for example, ventured to Neithernor.
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I’d split the libraries into two groups - wells and some playgrounds with only residues of energy. I can’t shake off the feeling that they’re like trees - the older they are, the stronger they get. Of course, you could repurpose a building into a library and stuff it with the most powerful books and artifacts but this would only lead to magiq flowing around, ready to burst out at the tiniest mistake. They need to get imprinted, soaked with it and this doesn’t happen overnight. In this case, the Morgan Library would be just a building that inherited what its owner started and fed throughout the century on what was stored in it. It’s a relatively young well and probably not as powerful as the ones on the old continent. But, let’s say, sticking to the US part, we’ve got a library that is build right next to where the Indians lived - then it would feed on and repurpose what was left after the original inhabitants. After all, the stones will still sing their own songs if let.
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Lauren? I believe she was both confused and desperate to find understanding. That’s what led her to getting rampant and relentless, hoping possibly she’d either trade the results of her tasks for greater understanding or claw back what she thought she deserved. I’m convinced she wasn’t so blindly obedient as the email exchange with Cagliostro suggests.