Spoilers: To me, when Sulu was asked to take the conn, he became one hell of a acting captain. The way he addressed Harrison was epic and seemed to me that he actually had more confidence than Kirk sitting in the chair. He was strict and meant business and he wasn't reckless. Also when he was hovering the shuttle over the volcano he had to make split decisions and decided to abort despite Spock's line snapping and Uhura's pleas to stay. He put safety first. Any thoughts?