Daniel didn't stop training in the first movie. Mr. M taught him the secrets of his form of karate In the second movie (the Drum) , And In the third he Was trained by Cobra kai. They may not have taught him techniques, but he learned how to be a little more vicious in his attacks.
That would Put Pre- adulthood Goku in the 40+ ton range. And each member of the ginyu force would be much more powerful then him, So I don't think you can say that Ironman has that huge of a strength advantage.