While the twins may have been led to believe that Rebecca harmed Max, think about the possibility that Jonah was well aware of what caused Max's injuries, and that he perhaps initially was able to get Rebecca to go along with his version, and that he could not risk her coming clean with LE about what really happened...........I don't believe anything that has come out of that man's mouth, directly or indirectly via his PR machine and/or friends.
I have the utmost respect for you & Mrs. Holmes, but I don't believe Jonah was present at the time of Max's injury, and I don't believe Jonah killed or plotted to kill Rebecca.
I say thusly because as Ann Rule writes in her book, Jonah has alibi for entire night of Tues into Wed. He was witnessed on hospital and RMH videos numerous times. Also he has no motive since I think he honestly believed that Max's injuries were a result of Max's own independent play and that Becky (and her sis XZ) had nothing to do with his accident.
One, I don't believe Jonah as a father would allow his gf/lover/significant other whom he was seriously considering marrying and whom he seemed to be in love with and at peace with to take the blame for such a heinous crime if in fact, Max had an injury as a result of Jonah himself or his elder two teenage children. Honestly, why he would purposefully blame Rebecca when he loved her? That would only cause Rebecca to get on an even worse relationship status with his ex-wife Dina whom he knew hated Rebecca with a passion. So that makes no sense that he would place blame on Rebecca.
Two, again I don't believe Jonah thought for one second that Becky hurt his son Max in any way -- intentionally or accidentally. If Jonah did question whether Becky was responsible for Max's injury, then he would have joined his ex-wife Dina's request to reopen Max's case. And to date he has been silent about it.
Three, Jonah seems to be the kind of person who's able to let go and forgive and move on with his own life. He already divorced his two exes -- Dina and Kimberly -- even though he had to pay alimony and child support since they both had kids with him. If Jonah no longer cared for or loved Rebecca, certainly he would have done the same -- moved on. Additionally it was easier for him to sever ties with Rebecca if he was "through" with her since they weren't even married and had no children together, and thus, there were no messy financial obligations that he would be legally liable for with Rebecca. So no, he really has no motive for killing Rebecca if he simply hated her and wanted to leave her.
The only thing that gives me pause about Jonah is his seemingly easy acceptance of Becky's "suicide" upon hearing it from his brother Adam. If indeed Jonah never returned Adam's one text about Becky "hanging herself" then yes, I would be suspicious. But somehow I believe he likely had returned his brother's text to confirm or extract details from Adam but that we the public just haven't heard reports about these returned phone calls to Adam from Jonah.
Other than that, I think Jonah is innocent in regards to Becky's murder and also Max's fatal injury. I also think his older teenage kids had nothing to do with Max's injury either. I just don't see how teens would be able to move on and hide their involvement from their friends or other family members if they had indeed accidentally or intentionally hurt Max and caused his accident. Teens like GS and ES seem to be arrogant and have big mouths, and I am only basing on what I've heard about the two of them and how they post indecent things online and how they boast to friends.