Look at smaller details; whether or not Sayaka contracts in the earlier timelines, Kyouko's appearance, whether or not Octavia has Hitomi-based familiars or if they meet certain Witches...
After all, according to Homura, Walpurgis' point of appearance is a statistical probability to her...meaning that sometimes it shows up somewhere ELSE, but on average it has a preferred spot. How could SHE influence that?
And if we accept other things like manga and the PSP game, we've got stuff like Oriko, Kirika, and Yuma sometimes showing up.
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