He didn't replace it, he made a demo. The original owners then had to implement his design. I've coded up demos as tools for getting my point accross for a par

He didn't replace it, he made a demo. The original owners then had to implement his design. I've coded up demos as tools for getting my point accross for a particular feature. I don't own or maintain the resulting implementation. It was a proof of concept. He proved his point. Though if you make too good a demo, you might end up gettig assigned to do the rest, and that is danger you speak of.