I also agree with 50/50. The sober side spouse is usually codie/enabler and that's their 50% contribution. We see many times the A go to recovery and the marriage bomb due to the sober spouse not correcting codependent and enabling habits.
I also like Amy's saying it takes 2 to make a marriage and one to destroy it. I have read through your threads and your husband is/was abusive. Who contributed what to the demise IMO doesn't matter. When the marriage or relationship is abusive there is but one thing to do - exit. The abuse? Well that's ALL on him.
Wishing you peace and happiness in your future its a bright one! Glad you are out of this.