They tried...that Glenn guy from Fusion tried to tie Trump to Epstein in 2015 but on investigating they found that there was only ever a social connection. Bill Clinton however...so they dropped it pretty sharpish.

So called Black Book is what the media call it. He would likely have phone numbers of everyone in his social circle no matter how vague, including people like his tailor or caterer, so means nothing. Only he knows what connections are the iffy ones.

The flight logs now, they are more interesting as he wouldn't just invite anyone on those. Even then it wouldn't assume guilt, if someone only went once they could have tried to recruit and failed so didn't get asked again.

Frankly, at that level of society it would be a surprise if someone rich and connected wasn't in his 'book', whether it is to foster a connection, or ask for a donation for something. Don't jump to conclusions just because he puts someones name and number in his book it means anything.

Think about the people you have listed in your address book/app. If one of them turns out to be a serial killer in a few years and it was noted that you were in his book or he was in yours, how would you feel being linked with him when you barely knew the person beyond occasional social interaction?