Both Jennifer and James Crumbley gave their 15-year-old son a firearm as an early Christmas present and took him to the gun range multiple times.

According to Ethan’s texts and journal entries, they both were dismissive of his mental health struggles and requests for help.

They both were made aware of Ethan’s disturbing drawings on a worksheet, including a gun, a person bleeding, and the phrases “the thoughts won’t stop help me,” and “blood everywhere,” on the morning of the shooting. And they both were present at a pivotal meeting with school counselors that same day, during which they declined to take their son home from school and did not mention his new gun or his mental health issues.

Finally, after the shooting, the two fled town, sparking a manhunt that ended in a late-night raid at a Detroit warehouse.

Yet some pieces of evidence differ, particularly around firearms, his knowledge of their son’s mental issues and their personal traits.

For one, James was the parent who physically purchased the Sig Sauer 9mm firearm for their son at a gun range, according to receipts. He also was more familiar with firearms and, according to his wife, was the parent in charge of securing the home’s three weapons.

“It was more his thing, so I let him handle that,” Jennifer testified.

Speaking to CNN’s Rahel Solomon, CNN legal analyst Joey Jackson said the firearm argument would be difficult for James Crumbley.

“He’s the person who purchased the weapon, he’s the person who was supposed to secure the weapon, and he’s the one who Jennifer Crumbley was blaming with respect to allowing Ethan to get access to that weapon, so it cannot look favorable for him as his trial comes forward,” Jackson said.

Secondly, the case heavily relies on what the parents knew about his mental health issues, and several pieces of evidence from Jennifer’s text messages may not apply to James. For example, Jennifer was the parent who heard from a school official the day before the shooting that Ethan had been searching on his phone for ammo. She later texted her son, “LOL I’m not mad at you. You have to learn not to get caught,” according to text records.

How much did James know about that and other incidents, and will there be texts to prove it?

“The case lived and died on foreseeability. Was this foreseeable?” trial attorney Misty Marris said. “What somebody knows and when is going to be critical to that.”

Finally, the prosecution in Jennifer’s trial portrayed her as an inattentive mother, introducing evidence on her extramarital affair and her deep interest in her horses. The evidence of James’ personal issues presumably will be different.

How the legal strategy might differ

What will James’ defense strategy be, and how will it differ from his wife’s?

Will he, like her, take the stand to offer his side of the story? Will he, like her, blame others – the school, his spouse, his son – for the shooting, and express no regrets? Might he even take a plea deal on lesser charges to avoid trial?

These key questions are unanswerable at this point, as the attorneys in the case remain under a gag order. Mariell Lehman, his attorney, did not respond to a request for comment.

Still, his defense team likely watched Jennifer’s trial to glean insights into what worked for her and what didn’t, said Frank Vandervort, a clinical professor of law at the University of Michigan Law School.

“It’s like a football coach at halftime, making adjustments to what the other team is doing,” he said.

On the other side, the prosecution will also know what worked and what didn’t in making their case, Marris said.

In addition, there are broader societal forces that could influence how a jury sees his case. Vandervort noted mothers face higher standards than fathers regarding childcare, and there are gendered expectations of how mothers and fathers should act.

“We tend to think of mothers as caretakers of children and the ones responsible. We’ve come a long way in that regard, but there’s this underlying sexism in raising children,” he said.

Both sides will also know about comments from the jury foreperson, who offered insight into the topic that was a sticking point during deliberations: how exactly Ethan got access to the weapon.

“The thing that really hammered it home is that she was the last adult with the gun,” the juror told CNN, referring to surveillance video showing Jennifer carrying the gun case days before the attack.

Marris said that insight would be helpful to both the prosecution and the defense, as they each try to answer that question.

“They kind of know what the pressure points are,” she said. “She has her testimony about what happens with the gun. She leaves this gaping area open that we don’t know, and presumably he fills in that gap, especially if he testifies.”

CNN’s Christina Maxouris and Lauren del Valle contributed to this report.