Have to weigh in with the ENTP assessment of Lennon ... sorta easy enough to recognize one when when you are one. Doesn't seem at all like Michael Jackson... how this type of connection can be made is beyond me.

Paul McCartney is ISFP (i've seen enough of his quirky interviews to convince me this is true) making him and Lennon duals. In this situation they'd be working seamlessly enough to make any argument about who wrote what moot.

From memory i'll have to go with ESFP for Yoko. Super-ego to Lennon ... Similar temperaments, life rhythms etc. but far from duals.