While I agree with your statement about execution, it sounds like he was involved with execution as well. According to the lawsuit, they agreed to create a joint venture, giving him a third of the company and then they lived and worked together until after launch. He also claims to have designed the logo, did much of the social media, and created the TOS, Privacy Policy, and FAQ, drafted and filed the patent application -- this isn't about ideas vs execution. I don't know what the other side of the story is, but this is a really good example of why nobody should ever rely on verbal agreements for things like this.