Perhaps Touru's father or mother was a LOKI agent, and was outed a bit when Rasalhague seceded from the Draconis Combine. Either that or ROM and similarly involved, though that might make it less likely that he'd be accepted into the Nagelring. I think going with an intelligence agent parent and the other parent becoming a willing accomplice and the both of them taking their kid into exile is a good fit for his 'fight dirty' mentality anyway.