Talk:Alicorns/@comment-24426075-20150102000633/@comment-26943476-20150123002225

Celestia stated that Star Swirl could not understand friendship, whereas Twilight did. She replaced him as the one to complete the spell. Star Swirl would have become an Alicorn had he known about friendship well enough. There's also a part in the comics that shows Star Swirl as an Alicorn, so I would say it's just either toy bait (more likely) or dumb luck we haven't seen any Alicorn stallions.