Hmm possibly I think it could be a saving grace I mean if it was the mixing with the Pheru that corrupted it then the other ships still out there may very well birth uncorrupted precursors that could aid us after seeing what an abomination the others have become going so absolutely against the mantle. Plus seem a bit suspicious to me that the primordial stated that the precursors would return 100 millennium hence (generally accepted as a typo and was meant to be 100,00 years) and here we are 100,000 years later and still viable uncorrupted powder on these ships not to mention those that went dormant instead of becoming powder.