#2 The Imposter Kane never happened
If Kane hadn't taken off his mask, then it wouldn't have been so shocking to see an Imposter Kane make his debut. Luke Gallows put on Kane's old attire including his mask to battle an unmasked Demon in 2006.
The angle didn't go very far and was scrapped before really taking off. But the two did have a pay-per-view match which the Imposter Kane won. However, the next night on Raw, the real Kane attacked the Imposter backstage, took off the latter's mask and kicked him out of the door.
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One of the cooler things about this feud was seeing an updated Kane facing a throwback version of himself. It was like a video game in a sense, but the nostalgia wouldn't have been there if Kane never took off his mask in the first place.