We haven't collaborated at all but are working on very similar projects, so probably do think a lot alike. I last checked shopspec out when the creator mentioned it in the thread[0] where I first shared Sawdust. I just took a look and it has definitely grown in a similar direction, but I certainly wouldn't attribute that to anything aside from similar people working on similar projects and communicating with a similar visual language.
[0] https://news.ycombinator.com/item?id=49234277