No, honestly in regards to Josh, now that they know what that book is, I see him and Sophie as the 'rightful' owners of the book. Once it's in their possession, even bits of it, I don't see them misplacing it or surrendering it without a fight. Josh was 'meant' to tear those pages from the book. Nick was 'meant' to give them into Josh's keeping. Pre-destiny. The Twins were 'meant' to have the book.
----To me, Mars was weighing Dee and Machiavelli, reading their intentions. The same for Josh. There's a latinized phrase in my signature: Nosce Te Ipsum ~ Know Thyself. Josh had to know, had to be completely sure, that this is what he wanted and would be fully committed to the process. There's no middle of the road. I'm curious now, if that somehow had to do with the Awakening of his twin sons, Romulus and Remus. Was one not truly sure they wanted the power? Not ready for it. Or not ready for the responsibility to themself and others?
-----That doesn't bode well for Sophie if she were to have been Awakened by Mars, because she's still not sure she wants the power she now has.
-----We'll just have to wait and see what demands Mars will make on Josh. To help him escape? To help him make war? To put an end to his suffering? Who knows, those demands may turn out to be for good, rather than evil.