I have read all of your posts and I'm trying to sort it all out. If I'm not mistaken, you believe that it was planned to go to Sherrill's home that night/morning to abduct Sherrill and Suzie, take them somewhere, and scare them into keeping quiet. But Stacy messed up the plan, resulting in the perps having to abduct and kill all 3 women.
While it's possible, I'm just not sure it fits. Sherrill was the only one home that night, Suzie wasn't even supposed to come home that night at all. Did the perps drive around all night waiting (hoping) for Suzie to come rolling up?
You said that Stacy ruined the plan by showing up shortly after Suzie. The girls were following right behind each other so I find it hard to believe that they wouldn't have seen Stacy pull up right behind her, in her own car. At that point, wouldn't it have been easier for them to abort the plan and try again later WITHOUT adding a 3rd (completely innocent) victim that everyone would surely want justice for?
IIRC you said that Suzie was the intended target because of her broad connections to seedy characters involved in drugs and other criminal activity. But none of those others ever went missing. Why?? Even if Suzie did have knowledge or saw something she shouldn't have, why take out her mother and Stacy? It wasn't necessary to get rid of her mother, seeing as she had no direct knowledge herself so what kind of witness would she really have been? In addition, how would they have known that Suzie didn't blab to one of her many friends, coworkers, etc?? And if they were really worried about Suzie, it would have made more sense to just disappear HER... she was an adult and now a high school graduate, she had left home before to live with a boyfriend and also her brother and seemed a free spirit, so if only Suzie had gone missing it would have been hard to prove she wasn't missing on her own free will. Instead they add in her mother and a completely innocent girl , complicating the case and bringing much more attention to it.
All that these alleged perps did was bring massive attention to everyone's alleged criminal activities and put everyone under LE's microscope! Which is what they ironically were trying to avoid in the first place lol! You would think that someone would have been punished for this at some point by the higher-ups in this criminal hierarchy, yet I don't know of any other deaths or missing persons connected to this seedy underworld you speak of.
So at this point I'm not convinced that this theory works, though I'm new to the case and still working so I could end up changing my mind.