Kurt was definitely an IxFP. He rarely talked during interviews and pretty much let Krist and Dave do it all. He really was only his wacky self when among friends or on stage (his outlet). Plus, all his song lyrics are about his personal feelings and morals, and although Nirvana music isn't exactly difficult to play, it makes up for that through strong emotion. He also said "I feel" a lot more often than "I think."I've got Lennon as INTP and Cobain as XNTP. But, it's tough to really know. I predict they can figure this stuff out within 5-10 years definitively.