I used to know a guy just like JI. (Well, I still know him, just don't see him much anymore. lol) His behavior seemed odd and made lots of people uncomfortable. He was a super nice person, just painfully shy. I kid you not - so shy that when we would go out to dinner and the server would ask for his order, he could not even talk...or make a decision. I've never been able to figure out which.
However, one thing I know for a fact is he was as honest as the day is long and would give you the shirt off of his back to anyone who needed it.
I have always felt that DB played Jeremy like a fiddle and used his quiet, non-confrontational nature to her advantage. I think Jeremy WANTS to believe DB because if he chose not to, it would be devastating to him and more than he is willing to face.
I recall Valhall's input here a couple of weeks ago. She wouldn't name her source but did say it was someone from the Irwin side of the family and that they doubt DB's story. I don't think the Irwin side of the family likes her even a little bit.
ETA: I'll say I am still on the fence about a lot in this case, however not about JI - I personally believe Jeremy had nothing to do with Lisa's disappearance.