My take and my opinions only. I agree with Curious. In my experience, as an avid sports fan, over the age of 50 and one who went to hundreds of parties and sports bars to watch football with the guys and gals over the past 35 years, including living with other guys in "man caves" - many tv's all over the place:
These gentlemen were "professional Kansas City Chiefs football watchers" and partiers. They had very normal habits that they had repeated for years. Every picture shows them together wearing their team's football jerseys. Their families knew about this. Their wives/fiances/parents were so used to them doing this, and being wasted and not coming home on Sunday night game nights, that they were not looked for when they did not show up for work the next day (Monday) for 2 days. They had done this before.
They all decide where they are going to go before each game and come prepared with beers, cocktails, weed, etc. But when coke comes out, it is a big deal. Guys like this (we and my friends) don't "save" coke. They were drinking and watching games for 10 hours at least. They were comfortable in the house with their friends. They had done this many times before.
My feeling is the tainted coke came to the party after the games ended. That would have been around 10:30 pm at the earliest. Either the renter or the 5th man mixed it up, brought it out, delivered it or they had it delivered to them. That's who LE is looking at. JW, the 5th man or someone we do not know are the keys to who supplied it. And they are in trouble with the law.
JW going into rehab with a (my words) contrived, legally/family written statement along the lines of "he's going into rehab immediately in order to deal with his issue head on - an enormous, heartbreaking wake-up call' - that he needed to seek professional help is a sympathy play and an attempt at avoidance.
I also think he had 2 days to try to clean stuff up in his place, was probably hoping some of the drugs in his body would wear off, he could have tried to move the bodies/flushed drugs down the toilet/gone to the dump to dispose of evidence, etc.
The truth will out pretty quickly. In my mind there is no chance that the drugs that killed these 3 guys were there with them all day. It arrived sometime around midnight or later and they snorted it right away and it knocked them silly/killed them in a few seconds.