You can't say that for certain. You act like because he has no H2H feats, he is incapable of H2H, even though he was a certifiable Green Beret, which means he definitely received H2H training. Looking at the facts (same Green Beret H2H training, longer military service, stronger, more durable) Dutch would be the conclusive victor. It's ridiculous to say he loses solely because he didn't find the circumstance to fight somebody onscreen for the brief 2 hours the audience sees him.
Saying Dutch loses purely because we didn't see him fight is like saying Tyler Durden could beat Hoot from Black Hawk Down, AK from Tears of the Sun, or Willard from Apocalypse Now in H2H purely because they never fought onscreen. It's a nonsense argument.
And again, how does Rambo beat Dutch when hits from the Predator couldn't keep Dutch (who was also hit with a plasma cannon which blew off another man's arm) down? And LOL if you say Rambo is better skilled in H2H than the Predator.