Let me play the devil's advocate. How do you know that you are right and they are wrong. All along you both were on the same page and you are successful. May be they are right. But, in any case, it all depends on the contract you have. Legally binding crap takes precedence. The next best option is to to sell, may be 60 or 75% stake to the other co-founder. They have the right of first refusal rather than selling it to your competitor. In any case, be very friendly. If and when it goes south, they may need you to right the ship.
As always, you are the best judge of the situation.
"One of Tetlock's findings from the Good Judgment Project was that cognitive and personality traits were more important than specialised knowledge when it came to predicting the outcome of various world events typically more accurately than intelligence agencies"
I think you may be confusing CS with Software Engineering. CS is a math heavy field that talks about computing machines, architecture, Operating system, among tons of other things. At Masters level, a degree of programming is almost always a pre-req unless the University is a diploma mill.
I have vast industry experience. I know lot of problems in different businesses. The challenge I have is putting together a good 2-3 member team. My friends are retired full time workers. If you are interested, DM me.
You have to choose the right road with right companion for the journey. If you choose the wrong road, does not matter how fast or hard you go, you will never get there.