You assume there are candid answers in there, though - in a deposition you answer as little as humanly possible. Your side of lawyers will ask a few key questions, any everything else is from your opposition trying to trip you up.
Well, candid means "truthful and straightforward", doesn't necessarily mean exhaustive. Sure, they are going to give away as little as possible, but considering it is a legal deposition and perjury is a thing, they aren't going to lie or actively dissemble like they might otherwise.