Quick and Easy Questions (please read the OP)

[Takanomiya Hijiri]

What he means is that the specific knowledge bit of "Secondaries are copies of their originals" is not something anyone outside of Omni would know IC. You're bordering on meta-gaming if you give your Prime that information without seeking an audience with Omni first.

Oh, right, I see. So if your character successfully was able to summon two or more copies of the same person then they might assume they're all copies, or they might think that the first one is real and only those that came after were fakes, but they wouldn't know for sure without asking Omni, is that what you're meaning?

Because the actual business of finding out that they can summon additional ones can easily be determined through trial and error... Schwi Dola actually had asked recently what would happen if she tried to summon an extra copy of her secondary in order to check if the first was still alive and was told that she'd just end up with two of the same person.
And if she would be allowed to do that without meeting Omni then it makes sense that others could too.