It isn't a requirement that all of the chosen jury members must have no knowledge of the TB case or the 2 accuseds (or the LB case, for that matter). In the TB trial (and I'm sure in this trial, and probably any criminal trial), all potential jurors were given the same series of questions, and based on their responses, (and/or anything else, including portrayed attitude, body language, vibes, whatever), they would be accepted, or refused (without a reason having to be declared), by each of the 3 parties (2 defence + Crown).
In the TB trial (and perhaps the questions may have been similar in this trial, or not!), in addition to questions re whether they had seen, read, or heard anything about the case or the accuseds, the questions included things such as: how well they remembered the things they'd seen/heard/read about the case or the accuseds, whether they'd formed opinions as to guilt or innocence already, whether they'd participated in discussions on SM wherein they'd expressed their opinions regarding guilt or innocence, whether they'd formed opinions through discussion with others, and whether they'd be able to set their opinions aside to fairly base their judgement on only the evidence presented at the trial and the judge's instructions. It was really interesting to listen to their answers and watch the process. jmo.