Yeah he brought it up, but it's not really his secret and he's clearly reluctant to say more.
We know enough to press Dresden, which we should do when we can.
But the whole point of being here was concern over Dresden's lab getting shaken down for secrets and magic goodies. We're moving into violating his space and privacy to a degree I at least am uncomfortable with doing to someone we call a friend.
It's annoying to slow things down, so I can understand voting to proceed, but now that I've thought more about it I think we're going a bit too far given Molly and Harry's current relationship. We aren't playing Murphy here; we're his friend's kid, not a trusted ally.
We're edging into some sort of weird para social relationship based on our OOC knowledge of Dresden that isn't really representative of how well he knows and trusts Molly.
1)We cant press Dresden. He's in prison. Only conversations between a prisoner and his lawyer have any legal protections against eavesdropping in the US; every other visitor or phone call is recorded or monitored in real time, and in this case we have reason to believe that multiple actors in this case will try to listen in anyway, even if it is illegal.
I presume Dresden will be a lot more unhappy if we ask him about this in the hearing of the NSB.
2)Im not really seeing it. Molly isnt rifling through Dresden's secrets for fun or curiosity here.
He's in multiple interconnected jams that needs unfucking, and this particular information seems relevant.
Remember that Infernal!Molly has soulgazed Dresden.
She's had a cordial conversation with the shadow of the Fallen inside Dresden's head, the one he was worried would get him killed by Michael or the Knights or the White Council.
He already trusts her with secrets that could destroy him.
Bob is dangerous, but a couple tiers down as a hazard.
3) Part of the reality of investigations is that you sometimes need access to private information.
We see this in our PC's immediate backstory, where Molly's use of black magic and Charity's cult history were both materially significant factors in how Molly ended up on a tree of ice in the middle of Arctis Tor and were both things Dresden needed to know to solve the case and save her life.
Dem's the breaks.
EDIT
4) Also, as a matter of personal safety, if there is a Winter Court element in this?
We'd much rather have forewarning as soon as possible before blundering into it in the field, so we remember to carry an iron crowbar as backup.
Dresden would presumably be a lot more unhappy if we ran into a squad of fetches in the field with no forewarning and got shanked.
EDIT2
5)We could get this information directly from the source. By asking Mab.
Int 4 + Occult 5 means we can probably kludge up a Calling, and Cha 3 + Etiquette 2 suggests we would be able to avoid giving offence. But Dresden would presumably like that even less than our asking Bob about this.
None of our choices are perfect.