Perhaps they think there was more than one person involved? Perhaps DH was visiting DR that evening? Or supposed to? Perhaps he was known to DR's family for some reason, and dropped in, or was thinking of dropping, but didn't (which perhaps DR might not know).... LE may know more than we think, and aren't ready to realize DR as a POI for some reason. I'd like to know what that reason is exactly. I'm sure hoping its coming out in the coming days.
Maybe LE hopes that with DH being named, DR will now feel more free to speak up if he has more to say?
Just my opinion but I've always felt this whole DR thing has just been one giant red herring. I don't believe he has anything whatsoever to do with it.
The last thing DR or anybody would do if looking to himself or be involved with someone else abducting a kid is do it on your own property all the while leaving two witnesses that live in your own neighborhood. I believe local LE was exasperated from lack of progress and decided to finally give him a serious look in 2010 and nothing came of it. Upon finding out about this many people assumed he just must have done something and married themselves to the idea that he is somehow involved.
Even after all the new developments several people seem to believe still that because of something LE did 5 years ago that absolutely nothing came of that he must still be somehow connected.
I also don't think that predators like DJH is alleged to be would pick up accomplices along the way that far into the progression of their crimes. I imagine in most cases of multiple offenders they were together because of a shared sick interest and built upon it from there. Again just all my personal opinions.