My T works with court ordered clients. I know my T will give 110% to try and get them to benefit from their time with him but ultimately it is still up to the client. I also know that T would be honest in any reports about the progress in therapy and the likelihood of reoffending.
Going back to my days of studying offenders I would guess ex-H is a fixated offender and the least likely to be able to change. That reasearch is pretty out dated now though so they might have better outcomes.