I have 2 theories. They are based on a mix of info from LE, rumors from good sources, unsubstantiated rumors and complete assumptions. I apoligize in advance to anyone who may know any of the principals and find these theories offensive.(feel free to stop reading now...seriously)
Theory #1 (i can't decide if I like this one or not): MAC leaves the beauty school @ 3pm. She runs an errand, could be anything, but has a planned meeting @ boat launch at 3:30 with a new boyfriend (have heard rumor of recent break with bf). He is 17 and gets out of school around 3pm and has to be at his job at Lowe's at 5pm. He is late...at 3:40 she texts her old bf "hey" and he texts back "hey". When I text my wife "hey" it normally means 'hey, can you talk' and when she texts "hey" back I then call her. I find an exchanges of "hey" texts without a call or further texting to be extremely unusual. Before she can call the old bf the new bf arrives in his vehicle so she doesn't make the call. They sit and talk or do whatever 17 year olds do, or maybe she picked up food for them as the errand. Then they decide to go to the car wash out of boredom, hence the info from the car wash attendant. They get back to the boat launch around 4:45 and she drops him off at his car so that he can go to work. Now, MAC has a prearranged meeting with WC at the spec house at 5pm for whatever reason.
RC knows that MAC is meeting WC before coming to Orondo for dinner.
MAC arrives at spec house and goes inside where she is attacked by JF and WC and killed. The reason??? Turns out that WC has a substanial life insurance policy on MAC (pure speculation). But consider these facts/rumors. WC claims to be too broke to pay for the funeral, yet she probably has a house payment, a payment on the spec house, part of her sons tuitions, etc., a lot of money going out each month. JF has filed for bankruptcy, has a failing business, is getting divorce w/ 3 small children(child support), house in foreclosure, etc, etc, etc. BTW, JF used to have a drywall/painting business by the name Well Hung Drywall and Painting (fact).
Well Hung Drywall & Painting
(9 Glendale St., East Wenatchee, approx. one block from 18 Lindwood)
http://74.125.95.132/search?q=cache:...&ct=clnk&gl=us
Yet WC buys JF a new truck within days of MAC disappearing...maybe she figured she was going to be coming into some money because she surely cant afford a new truck when she cant afford MAC's funeral.
From certain rumors it is very possible that MAC and WC have never, ever been close and that MAC's childhood was pretty rough. WC and BF now have to move MAC's car. WC drives the car to PC, BF follows and picks her up. The car is found. While WC is up PC with police, BF moves the body to the house at CB. RC know that MAC was to meet WC, tells police, WC says MAC never showed up. This would explain why LE searchs the spec house BEFORE the body is found. Bf partially dismembers the body to make it look like the killer meant to dispose of the body to throw off LE. Then during the candlelight vigil BF moves her body to a place near the pond where he knows it will be found fairly soon (needed for the life insurance).
From the start WC and BF are suspects. There are LE posted near her house 24/7 to watch them. LE is not hiding the fact that they are watching.
WC and BF are both heavy drinkers (rumor of DUI's). In the wee hours of 2/20 WC (drunk) calls 911 and complains that those LE s.o.b.s are harassing me. Must be awful nerve-wracking to be watched 24/7.
The 3 rumored 911 calls that occurred later could be the same thing (messing with LE) or could be that things are falling apart in the house as the realization of what she has done begins to set in.
I think I got everything in there, feel free to shoot it full of holes. Since this post is so long I will post theory #2 seperately. Again, I apoligize if this offends anyone, it is not my intention.
R.I.P. Mackenzie, I know you have now found a PEACE that doesnt exist in this world.