You seem to be assigning the capabilities of stealth aircraft to space launches. The energies involved are radically different. There is absolutely no evidence whatsoever that anyone has anything even approaching the technology needed to conduct an undetectable orbital launch. Again, I'd refer to the well-publicized launches of top secret NRO payloads. If the US government could launch those payloads without telling anyone, wouldn't they do it?
You've officially gone from leaning over the ledge to taking a flying leap into crazy land in my book.
orbital launch energy takes so much because you have to overcome gravity. recorded maneuvers of these Craft turning at thousands of miles per hour doing right angles indicates they don't have to care about gravity. so getting out of Earth's orbit shouldn't take so much energy besides there's never any heat signature or obvious propulsion system shown, so no it wouldn't show some trace if leaving. actually it's pretty crazy to convince yourself that something's crazy just because you don't want to think about it. you could just admit that the thought scares you and then start dealing with your feelings, that would be the sane thing to do.
You've officially gone from leaning over the ledge to taking a flying leap into crazy land in my book.