After reading this article, here's 2 observations (fwiw).
Yost doesn't put much emphasis on what Sanderson's impact could be. He mentions Sanderson/Thomson as unproven rookies. He places Sanderson on the 3rd pair. That's not outlandish or completely wrong, but Yost just doesn't place much upside in having him in the roster.
His opinion of Brannstrom is pretty dim. "Brannstrom is still regarded as a prospect, but he’s fresh off a grim 2021-22 season." I guess this is based on what the advanced stats numbers say as that's what Yost does. Nonetheless, the word "grim" just kind of stood out for me.