I think he is guilty, and that he will be found guilty at the end of the trial.
I think the evidence of the injuries to his body, the blood and hair in the car, the insurance, and his early reaction are all strong indicators of his guilt.
His inadequacies as an man, husband and father have been illustrated- the affair, the failing business, (there are lots of good reasons why businesses fail, but, as far as I can tell, there really wasn't in this case), the lack of support, and undermining of his wife, "belting" his girls, well, he didn't really provide anything but crap for his family, did he? His treatment of the business partners was awful, and even his treatment of his long term mistress was characterised by dishonesty and shabbiness. (I know the jury might not hear all of this)
Allison knew all about his failures and short comings, remember at one point he told a counsellor that he had blamed her for the disappointments in his life. (Considerable by the time of Allison's death)
He had the means, motive and opportunity.
Something had to happen that night, after Toni's call.
The life insurance was running out.
His attempt to secure the lifeline 300k loan had been unsuccessful
(His neck was smarting)
If there is no confession, the jury will have to read between the lines, and connect the dots. I feel confident that they will be provided with enough information to do this. The arrest was a long time coming, it is a strong case.