Even if we agree that it is possible for someone to have a "perception from a perspective outside of their bodies", that doesn't mean that such is possible regardless of a functioning brain. Actually, it might be case that such a brain is necessary.
Then cite a fact by which we can conclude that a functioning brain is necessary for someone to have a veridical perception from a perspective outside of his/her body.
I'm not sure you have understood the facts of the 3 cases (the experiences and veridical perceptions from an out-of-body perspective) I asked you to account for--have you? Obviously you haven't accounted for the facts of their experiences and veridical perceptions, despite my repeated requests.
And I think it might be because you haven't understood the facts of these cases, that you are conflating the issues of veridical perception from an out-of-body perspective and non-functioning brain. Let us take the opportunity to be clear on these issues:
The fact that NDErs have been shown to have and retain in their memories complex, coherent experiences and utilize logical thought processes when their brains have been deprived of oxygen sufficiently long to be unable to support neural activity (or where there may be only residual activity of the brain stem) is a fact that defies explanation of these experiences and logical thought processes as a physiological artifact. Just as I pointed out in the OP:
Even disregarding other aspects of NDEs, such logical thought processes and the having and retention in memory of complex, coherent experiences during the severely compromised neurological states in which NDEs commonly occur confound explanation of these experiences as a mere physiological artifact. In a 2006 article, Dr. van Lommel, after explaining that “[m]onitoring of the electrical activity of the cortex (EEG) has shown that the first ischemic changes in the EEG are detected an average of 6.5 seconds from the onset of circulatory arrest, and with prolongation of the cerebral ischemia
always progression to isoelectricity occurs within 10 to 20 (mean 15) seconds,” elaborates this issue:
The paradoxical occurrence of heightened, lucid awareness and logical thought processes during a period of impaired cerebral perfusion raises particular perplexing questions for our current understanding of consciousness and its relation to brain function. A clear sensorium and complex perceptual processes during a period of apparent clinical death challenge the concept that consciousness is localized exclusively in the brain. Parnia et al. (2001) and Parnia and Fenwick (2002) write that the data from several NDE studies suggest that the NDE arises during unconsciousness, and this is a surprising conclusion, because when the brain is so dysfunctional that the patient is deeply comatose, the cerebral structures, which underpin subjective experience and memory, must be severely impaired. Complex experiences such as are reported in the NDE should not arise or be retained in memory. Such patients would be expected to have no subjective experience, as was the case in the vast majority of patients who survive cardiac arrest, or at best a confusional state if some brain function is retained. The fact that in a cardiac arrest loss of cortical function precedes the rapid loss of brainstem activity lends further support to this view. An alternative explanation would be that the observed experiences arise during the loss of, or on regaining consciousness. The transition from consciousness to unconsciousness is rapid, and appearing immediate to the subject. Experiences that occur during the recovery of consciousness are confusional, which these were not. In fact, memory is a very sensitive indicator of brain injury and the length of amnesia before and after unconsciousness is an indicator of the severity of the injury. Therefore, one should not expect that events that occur just prior to or just after loss of consciousness should be clearly recalled.
http://www.pimvanlommel.nl/files/publicaties/Near-Death Experience_Consciousness and the Brain.pdf
The fact that people have been shown to have veridical experiences from a perspective outside of their bodies, in which they can accurately report events that they could not see with their eyes, is also a fact that defies explanation of the conscious experience and perception as an artifact of brain activity. A person might indeed have an entirely functioning brain during a veridical perception from an out-of-body perspective (there are reports of such), but his/her perceptions and conscious experience would be spatially separated from that functioning brain.
The above facts are why the hypothesis that consciousness is somehow (inexplicably) a by-product of the electrical activity of neurons does not account for the facts of the veridical perceptions from an out-of-body perspective and the complex, coherent experiences and logical thought processes had by Pam Reynolds, Dr. Rudy's patient and the Parnia 2014 patient.
Putting that aside, the other issue is what exactly is being meant by a 'functioning brain'.
See Dr. van Lommel's description above. Twenty seconds after the onset of circulatory arrest, a brain should not be having and forming memories of complex, coherent experiences and engaging in logical thought processes, if consciousness were merely the by-product of the electrical activity of the brain. Twenty seconds after the onset of circulatory arrest, a person should have no experiences, form no memories, and be unable to engage in logical thought processes, if consciousness were merely the by-product of the electrical activity of the brain.