Star Wars Question

Optimus Prime said

I’m assuming that Vader was the only Darth who was burnt to a crisp and needed head to toe life supporting body armor where a secret identity was even an option

Everyone would have known who every other Darth was before they turned to the dark side

Why was Vader so paranoid about it? Why would his identity even need to be a secret when no one else’s was?

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Who’s everyone?
No one knew about Sidious

And I can’t remember all of the details bc I was reading it to my son at the time (and I remember ‘our loud’ books less for some reason)
But
The jostling if everyone under the Emperor was intense and there was something about his identity that would have made him vulnerable - plus he had snatched of memory that was already making him confused