FO76 was mostly done by BGS Austin

Not true, most of the Rockville studio worked on the base game until launch, and had about 10 leads on the project. It created the majority of the base game + Wastelanders content, while Austin (which was a small support studio before 2018) worked mainly on the netcode and servers. While many people from Rockville moved on to Starfield around the end of summer 2018, the art and design leads were still from there until the release of the Wastelanders update. Since then, further updates are really mostly by Austin.

Blades was mostly done by BGS Montreal.

Who now work on Starfield, so by all means should count as "BGS". Blades is a mobile game, though, so I do not think it is relevant when talking about AAA releases.