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"No longer bedridden" can mean a lot of different things.
It might only mean he is able to sit in a wheel chair, for all we know.
Things is, after 5 years of no interaction / stimulation, your brain is for all purposes dead. I am no brain surgeon, but I don't know if it is possible to bring someone back after 5 years of basically no brain activity.
I have watched a few documentaries about the human brain, one in particular that fascinated me was this: The Brain with David Eagleman.
One episode was about brain rehabilitation, and a patient that was in a coma for a few months only had massive problems adjusting to society again.
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