I'm pretty sure the third suit in the hanger was Gaia or possibly Strike being repaired, I'll have to watch that part again to be certain. As for Destiny running out of power it could just be that Duetrion is some type of nuclear fuel, different from regular batteries to provide the power that Destiny requires to operate its engines to move at such speed and sustaine the phase shift armor, but still limited in operation time. The Chairman is trying to stay good in the public eye and using illegal tech like n-jammer cancelers might give him a bad reputation or maybe something that can be used against him by the politicians who knows.

Is it mentioned in Destinys specs that the extra images are provided by a Mirage Coloid system? I must have missed that somehow if it is cause then I can't fathom why the Chairman wouldnt use a true nuclear engine.

Unless it is some major oversight, I would have to say that Destiny is not nuclear powered at all. There is no way it could drain a reactor from the stuff it does while Strike Freedom is shooting a zillion beams everywhere, the power consumption ratios just dont add up.