I never though Gary actually simulated death with his powers. I thought he just messed up the sickbay instruments and then flopped down on the bed for added dramatic effect.
That's how I interpret it too. Certainly Mitchell was powerful enough to make the instruments stop functioning.
As far as the boulder killing him, I just assume that he was not yet fully recovered from Dehner attacking him. yes, his powers were coming back but maybe he wasn't completely up to full strength yet and was still weakened enough to be crushed to death under a big heavy rock
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