Umm... Hm. That surprises me now. But I welcome any new thoughts here. Especially when it comes to the Guards.
Could I at least ask you to tell me the source of your thought process? That would be very nice. For sustainability, so to speak.
But if you ask me now so without context and straight to plain: Nah. That sounds rather unlikely to me. And not because I would awaksene this scenario as unlikely. But much more because I think it doesn't fit to Celestia and her hidden army.
But as I said, feel free to give me your background information on the subject and I'll look into it ;-)