I'm pretty sure LE was onto sicko uncle as soon as they ran a check on him.
I don't think he had the opportunity to keep her somewhere and keep going back to visit her.
Considering she was buried, I think she was killed the same day she went missing.
I don't think he necessarily planned on keeping her alive for days anyway.
I think all the planning was for one thing..to throw the LE off in another direction so not to suspect him after he killed her.
Why else would he plant clothes in the opposite direction with bloody panties, and semen on a tissue (that he requested AR get on the 23rd) if he didn't want LE to think she was probably dead and gone.
I think his plan was to rape, torture and kill Brooke, and be done with it. Not to keep her somewhere for days.
He knew as soon as she went missing, the LE would be called, and be all over the area.
Noway he planned on her being tied up somewhere near his home alive for days.
He focused on Brooke and she became his fantasy, and he knew he'd have to kill her to get her to be with him sexually, because she'd tell on him. All the planning was for that one day, the day he took her , raped her, and killed her, and that's it...no plans for extented abuse over days.
That's my opinion.