well hell, after reading what wolfev posted I just got a bunch more questions.
First of all, the body emits photons? News to me.
But anyway: Marco underwent a lot of allergy type reactions from emotional stress. If it reacts in such similar ways, would the "glitch" apply to someone after the 2 hour mark? (I personally would doubt it as what's more stressful than being trapped in another's body?)
Plus I can't imagine the mass in Z-space is without protection. In fact if we're assuming parts could die, body mass would have to be preserved in some way so that it could undergo cellular processes, or it die from a lack of oxygen, at the least.
We also make a connection of the consciousness being separable from the physical form, which is questionable, but either way since if the body is allowed to "burn up", where is the original DNA being kept?
As confusing as all of it is, I think there must be some direct link to the mass in z space as to the morph body.
Sorry I just got back from an insane amount of studying. I'm in a questiony mood.