I think his only hope is for his two youngest children and perhaps his mother to beg for his life, with the implicit message that they know he is guilty, but want his life spared anyway might sway some. But I think as soon as there is a hint that Chad was wrongly convicted, framed, etc., it will turn the jury off. They seem very confident in their verdict, and won't like any disrespect of the verdict.
Chad probably can't speak, because I don't think he will be able to say anything respectful to the verdict. Admitting guilt now might help, but there is no sign he plans to do so.
I think there could be a credible "good record" report, good legal record, good standing in the community. His interactions with the community make me want to puke, but I think an objective case could be made that his record is good. But that doesn't really mitigate considering this trial was about 3 murders over about 6 weeks. The good record ended when Tylee was buried. And that is quite the first offense. The jury might not even "feel" that this was Chad's first murder if they have a hunch that Chad participated, "with no reasonable likelihood of conviction," but nonetheless participated, in murdering Charles.
There is little objective to go on to save Chad's life, so IMO, his only hope is the jury is swayed by family. And, IMO, Emma and Garth (unless they do a 180) can't be that family, because it has to be someone who respects the jury verdict.
MOO
Edited to add: There are some intense victim impact statements anticipated. If they ask for the death penalty, or do not ask for the death penalty, or even ask not to have the death penalty imposed because a victim wouldn't want it, that is more likely to impact the outcome then the defenses witnesses, IMO.
The best potential to save his life might be where we are not looking: with the victims.
They also have the most power to make it easier for the jury to call for death, although I think the statute gives a lot of support for imposing death.
MOO