I think the problem with the hair sample is that Casey and Caylee would have the same DNA pattern - so they can't conclusively say it was Caylee's instead of Casey's - except, that the length of hair has indicated to them it was Caylee's.
Supposedly the hair of a decomposing body has some type of rings that appear on the strands.
Thats what one of the pathologists was saying.
I agree with you on who the baby daddy could be. It would probably be easier when it comes to this Casey, to weed out who isn’t a candidate for daddy. lol