[quote]I'm not sure about the Spartan-III's, but what would Spartan-II's gain from integrating into it when their augmentations are superior already?[/quote]They would have the opportunity to train new recruits, and operate within the jurisdiction of the SPARTAN branch. For whatever reason, it currently seems they chose to not join up. At least the SPARTAN-IIs. [quote]Is it possible the surviving Forerunners would rise against the Didact if he would continue trying to stop humanity from claiming the Mantle?[/quote]Well, everything's a possibility. Is it particularly likely? No, not really.