Nicole

“That isn't why. She would have chosen him even if you'd had royal blood in your veins, even if you'd had the same blood as Kastor. You don't understand the way a mind like that thinks. I do. If I were Jokaste and a king maker, I'd have chosen Kastor over you too.'

'I suppose you are going to enjoy telling me why,' said Damen. He felt his hands curl into fists, heard the bitterness in his throat.

'Because a king maker would always choose the weaker man. The weaker the man, the easier he is to control.”
― S.U. Pacat, Captive Prince: Volume Two