>Inb4 obligatory "How dare you stand where she stood" comments
Hey, it happened to a cartoon dog, it'll happen here.
So, what if Sunset Shimmer never left Equestria and actually learned friendship? She obviously knows more than Twilight in some areas (See Sunset's questioning of Twilight about Elements of Harmony outside their realm, revealing the knowing of their existance, that they can take on a physical form, and their nature), so I assume Sunset would've just taken Twilight's place in everything, excluding A Canterlot Wedding.
(plus there needs to be more Sunset Shimmer art anyway)
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Edit; someone posted it to reddit: www.reddit.com/r/mylittlepony/…