I have seen some very bright minds writing on here, and I wish to say to you websleuths, hopefully with what I share, and some things that have me scratching my head, that you'll be able to bring light to more things than I can see on some points, and we can truly arrive at a better solution.
A couple of things that we do not know yet. IF the first of these next statements is true, then I think it's very bad for Mark, but when you hear how I handle that point (my own theory), I hope it turns out as I speculate. The second point, is not as damning for MS, but it would seem to weigh badly if it also turns out to be true, but you'll see that even if it is true, it is not necessarily damning for MS.
1) WW was NOT in Florida at the time of the murder.
IF WW was NOT in Florida at the time of the murder, I think Mark is done for. My words seem emphatic, but knowing the facts as you all do as well as my knowing WW and MS like I do, I think if WW stayed behind in Missouri, I don't see a plausible way out for MS. It would seem like nothing less than a hired hit.
2) JR purchased a hammer at the local WalMart in Lee County.
It's not been established that the kid JR (whom I do not know, nor never heard of before) purchased anything at the WalMart. BUT if he did specifically buy a hammer before going to the house, it would seem very bad.
So now, with regard to #1 - I'm not sure what the main objective is for WW, but he knows that the Siever family is up in Connecticut and has something in mind that he wants from MS' house. For whatever reason, wanting company?, he takes the rascal JR with him. The two of them are in the house when TS comes home unexpectedly, because, maybe, MS had said that they were not coming back until Wednesday (two days after the body of TS was found).
TS knows WW so when she comes home, WW is caught by TS and WW is in a very bad panic, for whatever they were stealing. JR, as we have come to find out, cannot be discovered as having left Missouri while on parole, and he is freaking out, telling WW, "Dude, I cannot, and will not, go back to jail!" Of course, both men know that they are in a horrible dilemma. WW who is now found to be doing a crime against MS, but only wanted something in particular, and the rascal JR's dilemma is he absolutely cannot be caught and turned in, because without question he goes back to jail.
So now an argument ensues. Wayne absolutely does not, and will not allow JR to kill her. He knows and even might like TS, but this is way over the top for him. He got caught red-handed by the wife of his very best friend. What to do?
The argument and heart attack in both is going on and on for 5 hours. Finally, tired, exhausted, Wayne sits down, or looks over at something, walks away from the specific scene, and JR does what he knows has to be done and strikes at her and Wayne is heart sick, but watched the kid JR do the bad deed.
Somebody said they saw a vehicle on the driveway and a guy with eye glasses?
I don't know where that is reported, but I certainly hope that is the case. It helps me to substantiate that WW was actually there.
Regarding the hammer. Somebody reported that he likes to keep one at his side constantly, like some people have sidearms and others carry knives in their pockets? And also, the hammer could have been necessary to break in the door to gain entrance to the house. So having the hammer was not initially for the murder, but then got used for it, if that does become factual that he bought one at Walmart.