Re: Thine Own Self mistake?
Just because you outrank another officer doesn't mean you default to taking command over them...especially if one officer is a Command officer (TNG redshirt) and the other isn't. Technically the captain can designate anyone they want to be in command of the ship, anyhow.
As for why Data never took the test...you'd have to ask him.
It was the best of Trek, it was the worst of Trek...
"If I lean over, I leave myself open to wedgies, wet willies, or even the dreaded Rear Admiral!"