IMO there's nothing else the prosecution team could have done in regards to this Eric issue. They brought in a speech pathologist, they had the head of the trauma burn center testify, they got several first responders to concede they could have misheard what JC was saying, they emphasized how chaotic and loud the scene was, and they even brought a few fire trucks to recreate the amount of noise when jurors went on their field trip. These were the additional things the prosecutors did to try and minimize the significance of JC's utterances.
They looked for anyone named "Eric" or "Derek" in the county and went through social media, interviewed hundreds of people.
They did everything but hire a medium/channeler and hold a seance to try and conjure the spirit of JC to ask her about Eric.
Seriously, what else could they have done that they didn't do?
No matter who tries to litigate the case, that "Eric" utterance, which was made many times by JC at the scene, is not going to go away. If only she had said nothing at all, QT just might have been convicted as all the other evidence points right to him. I think whatever justice is going to happen will have to happen in Louisiana or somewhere else.