Starlight and Stygian aren’t literally the same pony, but Starlight is still the stygian of the group. She’s the former villain and had a vested interest in believing that Stygian wasn’t evil either.
The Cast actually did question Starswirl. They stood up to him when he was decrying Twilight’s spell and put her over as a great mage. Like, they will stand up to him if they think what he’s saying is bullshit, but I still believe that they had little reason to doubt the pillars about Stygian. It’s driving because I feel like there’s no better way to say it. They were waiting for Stygian to return. To apologize. To explain himself. Anything. But instead he returned and tried to kill everyone and not just that, but to enslave Equestria as well. Why WOULD they doubt that he had been power hungry? The Cast even heard the Pony of Shadows speak himself, and he gave us such lines as:
“Don’t fret. When I extinguish the light and hope of this miserable world, you won’t remember any of this.”
and
“You summon me at your peril, Star Swirl! Once I defeat all of you, this realm will embrace the darkness as I did so long ago!”
Like, he sounds like a pure evil villain. The kind of villain like Tirek and SOmbra who the cast fought without a second’s hesitation.
[/spoiler] [/bq]
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