Usually, it is sound legal doctrine for a defendant to avoid taking the stand in a criminal proceeding; have your lawyer make all your arguments for you. The reason why is because if you take the stand and go up and testify, sure you get to directly tell the court your side of the story and your defense lawyer can make as strong a case as possible with your direct testimony. The flipside of that is that then you have to under oath directly answer questions from the prosecutor on cross examination, which can be disastrous for your case. Even in the case that you are completely innocent, it's a huge risk because the prosecutor can phrase questions in such a way as to make you look guilty. And if you lie on the stand, you can very easily get caught committing perjury if the prosecutor has evidence that any of your testimony is untrue. So, yeah, Meadows going on the stand is a very good thing because he stands to not just incriminate himself, but other people (like Trump) in the conspiracy as well.
Edit: Annnnd I didn't understand what you were asking. gg