: I'm pretty sure it was of no surprise.
1) The Hierarchs knew that humans were "Forerunner" or at least Reclaimers, so I still don't understand why it would be a surprise to them that humans were at the Ark given their obvious connection to the Forerunner. I know the Prophets and Elites and other Cov species probably found many other Forerunner ruins with no humans around, but it was specifically Regret who somehow didn't stop to think that reclaimers might possibly be on arguably the most important of all Forerunner artifacts? Maybe he was just hasty and didn't think of all the possible consequences, we kinda see that side of him in the book...
2) How do we know that Mendicant Bias is the Oracle from Contact Harvest? 343 was an Oracle, and evidently there were others around (like 2401 or whatever), so unless I missed a detail in the book, I'm not sure how we can say for sure that MB is the Oracle from the Dreadnought. Certainly an AI in a Forerunner ship would lead one to assume that it is possibly the same as the one from the terminals, but who's to say that MB wasn't just stuck on the Ark the entire time?
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