Except a chunk of the double recipients were awarded two medals of honor for the same action because at the time there was a separate medal of honor for each branch. And of those double recipients for separate actions, it's doubtful whether both their awards would survive serious scrutiny. For example, George Custer's little brother Thomas was awarded two medals but when you read about the actions you wonder if perhaps instead of commended he should have been brought up on charges for his recklessness, and how much the influence of his older brother, whom he was aide-de-camp to, was the actual reason for his commendations.
Also how the fuck could you possibly have time to earn three medals of honor? Pretty sure they pull you from combat assignments when you get nominated for any of the really high honors, and then you're stuck behind a desk waiting for the approval process. No medal recipient has been allowed to return to combat duty since Vietnam. Also also, very few people survive the action that earns them a medal of honor, so doing that three times is also fucking ridiculous.