Unrelated (or maybe semi related), I'm not sure how lax we are with the security surrounding Gendry, though I expect we gave him guards from the local garrison or at least some watchers from the Inquisition. But would Ceria have access to him?
I don't know where she stands on security clearance, as we didn't get to confirm her position as an Inquisitor on screen, but she was shaping up for it, but she would have made the request by now to start teaching him enough to reach out either to make that first communion with the Storm God or tap into his latent sorcerous potential.
She thinks it should be a choice instead of something dangled in front of an impressionable kid who will grasp magic with both hands without regard to what the source is.