The viewer continues: “Second, if during their service the abductee managed to die in such a way that they got into the light with an intent not to return, would their new in the-light status prevent the ETs from retrieving the recruit back into MAP service by time regressing their body in order to bring them back?”

That is also quite correct, that the death, if followed by a return to the light, would be undoable by the extraterrestrials. They could go back in time but it would be an earlier projection of the original being, the original self, and would not capture their recruit at a point where the training had been fully conducted. So, in other words, this is no different than what you experience within your current life. There was a prior moment to the current one during which you existed. If you were hit by a bus tomorrow morning, that would not erase your existence at the current point in time. So if the extraterrestrials journeyed back to the current moment, you would still be present in the living. What exists continues to exist until there is a change in the energetic configuration, and as long as the energy is present during a timeline, that presence will remain, it is not eradicated. In the same way, someone who lives until the age of 85 and passes on does not erase their existence throughout that life, leaving a quite detailed accounting many, many times, including video or motion picture evidence of their doings and perhaps writings of letters and diaries, and many emails in the modern era, and many remembrances on the part of those who knew them. But time regressing the body is not what this means, it is simply going back in time to a point prior to the death and they would be able to re-experience the presence of that individual. And, by the same token, after the individual dies during their tour and goes to the light, they could go back to the point when they originally commandeered their energy to project them forward into the future timeline and repeat the process if they chose to do so. For example, if they took a child and moved them forward in time to an age when they could be trained, that child will still be in existence on the original main timeline despite their death later on, as in your example, so this does give rise to many unusual potential circumstances.