Captain, if the Lieutenant Commander is brain-damaged, he probably ought to retire.
His brain isn't damaged. The docs grew some new bits to replace the parts that got eaten. His brain works just as well as yours or mine.
Oh? This brain of mine invented the terraport and upset a million-year monopoly on galactic trade and travel.
Is that the same brain you were using when you armed that anti-matter grenade?
Indiscretion is not the same thing as brain damage.