I don't know what 7 is supposed to mean, except that is probably refers to the Septimus Lodge, which appears in Bloodline and Secret Histories. But it's obviously important.
And to offer my theory of why Maurice didn't kill Jack in the basement in Conspiracies, I think it was the Otherness prohibiting him, because Jack needed to be sent to the Otherness. It wasn't because the Otherness had a score to settle, it was because it wanted to make him part of their army.
I think maybe The Lady (all one person, in my opinion) will have Jack do a "fix", i.e. saving the world. Problem is, since the last book has already been out, and I haven't read it, I could very well be wrong. Kinda sucks when you speculate about something that has already happened.
And by the way, there was a cop named Driscoll in Secret Histories. Could he be the same as Detective Driscoll in Infernal? Hmmm...