Pavonis wrote:

This is after he's kidnapped his old CO, falsified orders, hijacked Enterprise and set course for the forbidden world Talos IV.
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Kirk said Spock was consider the best first officer in the fleet, perhaps that appraisal is by the people
actually in the fleet.
The example you sight is a display of personal loyalty, Spock risked the death sentence to come to the aid of a fallen comrade. He put his life on the line for the benefit of another.
It isn't a matter if Starfleet Command thinks him the best, the officers and crews of the hundreds of starships out there in the darkness admire him for what he did.