One thing to remember is, LP was there for 9 days, and saw Casey in person along with her family. I don't think he puts these stories out there as facts, but just to get people thinking. People who know him and actually met him seem to think he has a heart of gold, and is honest as the day is long. IF you notice, he always precedes most of his statements with "I believe..." or "What we've learned is..." and if he says something is a fact... it is.
I don't know why he has the idea that Lee is Caylee's dad... it could be something his female BG heard, or one of the other BG's said or heard... or even something Lee said, because Lee did talk to his crew a lot, and Lee was in touch with LP even after he went back to CA.
LP went down to FL and bonded Casey out, in good faith that he would be allowed to talk to her and find out where Caylee is. He also believed at that time that Caylee was alive. Baez then did an about-face and told him they were not to question Casey AT ALL and so their hands were tied. Basically he used them as security and nothing more. Casey used him as a means to get out of jail, and then spit in his face, more or less... as did the Anthonys. The same thing they did to Tim Miller. They wanted Tim to go all over the country to look for a LIVE Caylee, and when he didn't, they turned on him PDQ, even accused him of stealing donations!
I know some here don't like LP.. that's their choice. But I believe he is a good investigator and has contacts in the OCSO and it's possible that he knows a lot more than we think that he can't talk about now. He is NOT a fool, and I heard him say that he went to law school. He does seem to have the respect of many involved in this case, and NG keeps having him on her show, so what he says is of some value. His theories make as much sense as some I've seen posted on these boards! And considering that he agrees with a lot of postes here who think Cindy is living in la-la land... what's there not to like??