what? No! how do you think that would work?
Courts usually call more people as potential jurors than those who actually end up listening to cases, yes, but the pool changes every week. The trial had been going on for months, how on earth do you think a 'B team' of reserve jurors would catch up?
How could you expect them to have the same view of the evidence if they just flicked through some transcripts as the jurors who actually witnessed all the evidence live?
If the defendants did get convicted that would be the first thing they'd cite in their appeal - half the jury didn't even hear my evidence first hand so didn't give me a fair hearing. If you're going to have jurors who haven't actually witnessed the evidence, what's the point in even having a jury at all?