The first time we see the classic Enterprise's destruct sequence, it's in "Let that Be Your Last Battlefield". We see it requires three participants: Kirk, Spock and Scotty -- the captain, first officer, and ... Scotty's role could *either* be the Chief Engineer, *or* the second officer, since we frequently see him in command when Kirk and Spock are both absent.
The second time we see it, it's the same procedure, and still requires three participants. Kirk still has the captain's slot. Spock is otherwise occupied (recognized as dead at the moment), so Scotty moves up to slot two (effectively I think he's the acting first officer.)
I'm wondering, though, about the choice of Chekov instead of Sulu for Slot #3. Back during the original run of TOS, Sulu was most often in the command slot behind Scotty. Chekov actually never took command once, in any event we'd seen before. And most recently before this movie, he had been Reliant's first officer, and was only filling in on Enterprise while Reliant was stranded. Did his first-officer-on-another-ship status override Sulu's status as (perhaps) acting second officer on Enterprise?
The second time we see it, it's the same procedure, and still requires three participants. Kirk still has the captain's slot. Spock is otherwise occupied (recognized as dead at the moment), so Scotty moves up to slot two (effectively I think he's the acting first officer.)
I'm wondering, though, about the choice of Chekov instead of Sulu for Slot #3. Back during the original run of TOS, Sulu was most often in the command slot behind Scotty. Chekov actually never took command once, in any event we'd seen before. And most recently before this movie, he had been Reliant's first officer, and was only filling in on Enterprise while Reliant was stranded. Did his first-officer-on-another-ship status override Sulu's status as (perhaps) acting second officer on Enterprise?