Possibility? Was God taking a "chance" or was he certain? If he devised the "Fix" from the beginning, it seems he devised the Fall as well.
[God allowed it] To help achieve His ultimate goal;
God needed sin to "help" [sic] him achieve his ultimate goal? And he was leaving that to a "possibility?"
[the goal being] the Glorification of Himself
God has "goals" and he needed sin to be able to glorify himself?