I guess that’s fair. And it’s certainly true that if Decker hadn’t been there, Kirk would have gotten them all killed in the wormhole (unless somebody else quickly pointed out the phaser redesign).Would he have, though? As he said to Kirk earlier, "Captain, as your exec, it's my duty to point out alternatives." As to the phaser strike, we never learn if Spock replied to his "We don't know that, Mister Spock. Why are you opposed to trying?" Spock might well have pointed out a reason Decker would have decided against it.