Yes. And I think the exact same thing is going to happen in this case.
The alternative suspect in the McStay trial was Dan Kavanaugh, who had an alibi, that he was in Hawaii with his girlfriend when the McStays were killed.
Much of the trial then involved the defense trying to destroy that alibi. They had warrants for DK's cell records and his bank records. And records of his airline ticket purchases showing he was in Hawaii for 2 weeks. And they suggested he may have snuck home in the middle of that vacation, secretly, and committed the quadruple murders.
I think a similar thing will happen here. The defense will say there is no solid proof that KB had thanksgiving dinner with her family and the State will have to bring in witnesses to show that she did.
And it will be up to the judge to determine how far off track he will allow them all to venture.
I think the defense will attack the evidence and lack thereof beyond what KK has claimed. The burden of proof is on the prosecution.
JMO