It is, unfortunately, common practice for the casting process to include choices nobody wants and therefore everyone can easily agree on rejecting. Studio executives will hate them and producers will nod: okay, we don‘t think he’s right either. Which will give them more wriggle room to fight for their choice.
In this case, BB knew that DC was a controversial idea, so she grouped him with others which could not top him.
Those will probably not wish to be regarded as „oh, of course, he would not have been as good as Craig, no way“.
Cavill, as you point out, would have been the fallback as the more conventional choice if MGM had boycotted Craig. But he might still be the Moore/Dalton/Brosnan candidate, the guy who came close before and stillhas a chance.
I just wonder which actor wants to follow Craig, now that BB cannot imagine anyone else in the role.
Either they will put Bond on a long hiatus to put enough distance between Craig and the new guy.
Or a young, gung ho actor who sees this as his big break will throw caution to the wind.