I just woke up from a dream and in the dream red John turned out to be a man dressed and disguised as a woman to throw people off at times but still killed and talked to menions privately as a man without the disguise or vise versa. I just thought this to be an interesting dream because red john would be able to keep his identity secret all while throwing everybody off but doesn't wear the disguise when alone or worried about being seen which explains why we see a masculine figure when he's alone or with the blind lady but probably never see the real red John or so we know when there's other people around. Maybe its my morning groggyness but it would certainly be interesting to see and would make red John more unique in my opinion.