On the contrary, it would be irresponsible to spill the beans. Akira is why Medis is still a queen candidate, considering she would have lost the bet against the scumbag prince otherwise. Not to mention he's pretty much her only trump card as it is, needed for personal achievements or even simply to make a difference. If she alienated Akira, he might as well hit the road. If his true power was known, the kingdom would definitely either keep him locked away (to use him as an elixir manufacturing plant) or maybe get rid of him out of fear. So, Akira would likely have no choice but to make himself scarce.