Yes, that shows how intimately CM was involved in MJ's personal life. It is irrelevant to the case that CM was unable to save MJ's life in that night. Name another person who is more knowledgeable about that topic than MJ's long running personal doctor.
He was not MJ's long running personal doctor, he was hired by AEG to accompany Jackson on his This Is It tour. They only met in 2006 when Murray treated one of Jackson's children. Not sure where this long-term personal doctor came from...