Of course they might, but it does not prove the case.
On a good day, a few teams from div B could probably beat the worst team from div A. But it should not give them a straight-up right to replace them. That is why multiple matches are played against different teams in all divisions. To cut down the random events/factors.
I agree that there should be a way for that WHEE team to join Division A, but it should be done in a way to make sure that these random factors are reduced as much as possible. I don't think only one match against the worst team is enough even if it is "EZ 12-0".
But could any non div A team beat the weakest div A team with such a large score difference ? I mean there is a good chance that the weakest div A team is just a div B team that got promoted last season.
I'm kinda assuming that that wouldn't be the case. But if you know any example of a serious game that prove this.
A problem i can imagine right now is for example:
A team is the weakest div A team without getting demoted ( so i guess 5th spot). And now it so happens that they got some new players in their roster making them much stronger, and no loger the weakest team (between the end of the season and end of signups)
So now the problem would be should they get challenged and possibly get pushed out to a lower division or should it be a different team ?
This does seem quite problematic.
But tbh i'm not going to bother with perfecting this potential change until there is at least some interest from the people that actually run beast.
Because even if i invent the most perfect system for this ever, if they don't care, it won't end up being used.
But i see your point yes.
Another way to do this would be what aprikosenmann mentioned. "a dynamic tournament"
I guess this would mean every beast things get shifted around a bit more manually so that there is greater balance within divisions. Instead of insisting on very rigid structure that creates unbalance i guess...