this
he is projecting his abusive training method started after Kyle's death him calling the knights useless is him calling himself useless especially during that battle. understandable he see's the MC as a fraud even with his party members visit her it didn't do much in terms of strength of...
Nah he isn't omnipotent
When he got okarun to say you beat me in the trivia thing he poked him and realized he didn't steal the powers cause he didn't know okarun lost his powers.
my guess is they have 2 genders
her having a twin is a false pretext it's just the same person female form has better magic while male form has better physical stats