I mean, they're the villains for Captain Marvel. So. As far as all of us thinking someone we know might be one, that's all speculation. Just fans having fun. For now :lol
According to Gunn, Peter never went back to earth or was concerned with it. I agree, GOTG have no reason to know of Thor. The Collector would, but not the Guardians.
I like the blonde (silver?) Widow. I just wish they had just allowed her to use her own hair. Widow DID have a short style like that back in the day with her grey suit.