Looking back, I love how instantly the Doctor and Jo’s relationship is solidified. At the beginning of Terror of the Autons the Doctor yells at her and calls her a ham fisted bun vendor and then in the very next serial they’re playing checkers in a locked cell together and shushing the Master.
I'm curious where you see Delgado in Missy? To me one is sane, a gentleman, even polite to Miss Grant. Missy is batshit crazy, thinks that giving the Doctor a Cyberman army is actually a /good/ idea, and certainly doesn't have the companion rapport with Clara that Delgado did. They're just too different to me.