Sometimes its not so much of a need but a want... maybe he prefers company for his playthrough? I know i always prefer to play with others even if i can easily clear the content alone.
I only took it as he said it. There is a huge difference between need and want/prefer!! It was just very funny that if he is level 50 but is starting a new P.T. then he must have been PL'ed I get all that but then why "need" 3 others to join?