A magical girl's potential is determined by the weight of her karmic destiny.
Homura twists back time with the sole purpose of rescuing Madoka. The entire fate of every single timeline – all of those billions of people – comes to depend on Madoka, again, and again, making Madoka the strongest magical girl to have ever existed, the only one who could stop Walpurgisnacht.
What if Homura did the same thing, but with Sayaka Miki?
Homura twists back time with the sole purpose of rescuing Madoka. The entire fate of every single timeline – all of those billions of people – comes to depend on Madoka, again, and again, making Madoka the strongest magical girl to have ever existed, the only one who could stop Walpurgisnacht.
What if Homura did the same thing, but with Sayaka Miki?