Originally Posted by Rorschach:
“If the Doctor were in a Coma in the room then surely Prisoner Zero would have been able to take on his form on it's own, and not have to have Amy tagging along as a second body.”
And Rory would have recognised the Doctor as one of the patients, not as the Raggedy Doctor.
The only way it would make sense is if the Doc in the bed had only just arrived and wasn't only pretending to be in a coma. In which case I can't see what possible impact he could have had on the plot since he didn't save anyone from getting killed.