NLW, I'm so sorry that you're proceeding to trial, but I understand it is necessary. My xh has played the same games and clearly hasn't been advised about the repercussions of hiding and misusing marital funds. There were things he did during our marriage that he will now have to take responsibility for. For years he told me that he didn't have to answer to me. Well, actually, he does.
At this point I've abandoned the idea of mediating. I really wanted to give it my all so I could just be done with this, but I'm not dealing with a rational person. He has a very skewed view of what's fair and reasonable. In my case it's just better to lay it all out for a judge and let them decide. It's costly, but I can live with it.