Spock is unique in the Kelvinverse; he has spoken with his future self (albeit from another reality) and has a unique perspective on his own life based on what he knows of his counterpart. He's his own (adopted) grandpa, essentially. (Little Spock Prime has also spoken to his future self, from an alternate timeline)
(Kirk only knows what little Spock Prime shared with him about his Jim/reality, from the Vulcan's perspective.)
Sarek has a rival for influence in Spock's life. How can he compete with his own son as a model for his son?
(Kirk only knows what little Spock Prime shared with him about his Jim/reality, from the Vulcan's perspective.)
Sarek has a rival for influence in Spock's life. How can he compete with his own son as a model for his son?