After the end of Yellowstone, there were a handful of characters whose fates were left up to the wind. While many of the main Duttons were almost instantly confirmed to be returning for more, others, like Gil Birmingham's Thomas Rainwater, were given happy endings and moved on from altogether. Whether you expected him to show up in the series or not, it's been confirmed that Birmingham will be returning on CBS's upcoming Y: Marshals as a part of the main cast. For longtime Yellowstone fans who felt like Rainwater was always underutilized on the show, this is nothing but good news.