[@The Irish Tree] No one has yet to ask Archimedes anything. Thus while it seems like he's talking to Leon he's actually talking to the whole group. It is a groups comms channel. He's not hiding anything from anyone. I can't exactly help if no one has asked him anything in the brief amount of time that has happened. 

Scarlett has also shown a direct questioning of Orson of things he can't help. I'll spoil this ahead of time and put it in such if anyone does care 

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Team A got cut off just before they went to combat a servant, and it was intentional on behalf of the person who helped trigger this singularity. The whole purpose of making this singularity was meant to completely disarm Chaldea as a backlog to the real intentions of the group. None of the Team A masters got a chance to give Orson real meaningful intel thus he has none to share. We will fair better because Team A managed to take the brunt of what was meant for them. That includes Saber, Berserker, and Caster servants.
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without spoilers he is in a situation where he's basically just in a spot where he lost his best team, wasn't able to find out how, needs to admittedly throw Team B into the fire and hope for the best, and Scarlett still insults him as if has any other real option on the matter. Clocktower mages are still arrogant to some degree even the more reliable ones such as Goredolf, and Waver. So even knowing of her condition he isn't in any mood to have his ability, or authority questioned when he himself is in a position where such a matter he was being openly mocked by someone even with a disability he wouldn't take it. As it stands Orson is a respectable mage, and person who is currently highly stressed, and could possibly be the person who loses humanity's foundation if he makes a mistake. He isn't the type of person who is going to simply backdown when questioned.

If the skeletons are an issue fine I put them up front there as well to give you two something to fight, and make sure no one gets bitched out in character for being not careful. I can quite easily just make them unaware or go poof.