C.E. Evans wrote:
Katra-storage was not a routine procedure and katra-transference to someone else even less so. Until the 22nd-Century, many Vulcans even believed it was just a myth left over from ancient times..
Hmm ok. Sarek seemed to assume right away that Kirk would be carrying Spock's Katra and taking it to vulcan. Maybe that family are just big fans of old mysticism?