Take a plot hole and, instead of revamping with long backstory, hang a lantern on it, like: yep, that’s there, moving on.
story
Save the Universe in Your Spare Time, From the Comfort of Your Writing Desk
Story may not be the only way to deal with the demise of everything, but it’s the best. We can’t save the universe, but we can find our place in it.
Friends Becoming Enemies, Enemies Becoming Friends…
The story is just more interesting if allegiances shift over the course of the story: friends becoming enemies, enemies becoming friends.