User blog comment:Gumball2/The "Sister"/@comment-30953185-20170712014426/@comment-4618045-20170712015913

You're right. Much of that episode does hinge on the "Sister" tendencies, especially that wager (so Lincoln is forced to never do his habit because he lost while the other sisters can continue to do their habits even though most of them also lost?). Also, the sisters were all in agreement over enforcing that wager (and you could argue that some of the sisters should have had the foresight to recognize the unfairness before this whole thing happened (such as Lori, Luna, or Lisa) but instead chose to coalesce around Lola (of all people)).

With that said, I think that ending redeems it because it acknowledges and corrects the unfairness that dominated the wager.

When you stop to think about it, most episodes utilize the "Sister" to varying extents. That's because the show has chosen to focus on making Lincoln the protagonist while trying to cram all the sisters into the frame just for the sake of not leaving anyone out (even if the screen time isn't used to develop the characters individually). While this can be used to reinforce how family can be tight knit, it becomes problematic when Lincoln is separated from that union or there's a situation where it's obvious some of the sisters should not be agreeing with whatever the mob is doing (there are also cases where both forces are at play at once, "Undie Pressure" being one of them). But the worst case is when such a problem is either not resolved or treated as normal (a pitfall that "Undie Pressure" avoids at the end).