What are the odds of the judge upholding the mediator's 80/20 custody recommendation?

My husband and I went through mediation with both of us wanting 100% custody of the children. I'm more worried about the safety of my children, primarily our child with a mental illness. He is has not been involved in her care. When we got the report back from the mediator, he recommended 80/20 custody in my favor. He mentioned that it appears the father is financially motivated and that he has not been involved until recently (when I asked for the divorce) in their lives. I'm just wondering what the odds are of the judge upholding what the mediator has recommended. My lawyer told me not to worry, that I have great declaration letters from doctor's and others who have been involved with me and my kids. I've also been a stay at home mom for 9 years and I know my kids well.