Oh, I know. I still remember when Iron Man was a C-lister.
But still, if comic sales are a consideration, they must be a extremely small, minor consideration. Studio had plenty of IP's available to them that looked like A-list properties compared to the GotG or Scott Lang.
Your point about Carol is a non-starter though. Marvel needs to use "a" Captain Marvel for legal reasons but the Studio didn't *need* to use Carol. Im very glad they did and she seemed the best choice in my mind, but she certainly wasn't the *only* viable option.