Yeah, I bet that a lot got lost in translation with all that was going on -- they (the FBI) were focused on finding GP at that point and that BL had disappeared for a bit wasn't as much of a priority to LE (it surely was to the L parents) especially since they knew there was surveillance on him -- FBI: he really couldn't have gone very far, and he's not talking anyway, so we've gotta go all out to find GP through other means.
Or something like that....
Not to make light of this situation, at all, but it will make a fascinating true crime podcast or novel one day...