I don't think they're going to use too many characters that are deeply rooted in the MCU because they're still figuring out what continuity '97 will have with the cinematic world. (Or they already know!) I think it's much less risk for them to do one character at a time, like Ronan or Cap. Hence why they drew Uato a bit differently. Didn't have to fully commit to him being the same as the What If version.