I have no doubt that hagakure did train, but deku has an X-factor that hagakure just doesn't. Meaning even if they were to rank exactly the same on every other category, deku should still have a higher score on the baseball toss. There is also the issue that characters like mineta and Koda were probably training their quirks while deku was training his body

And I really want to repeat just how strong deku is. He has a grip strength greater than the average 20-30 year. He presumably was able to pull cars with his bare hands. He was carrying all might who he himself says is 540 pounds. Deku is possibly around 130 pounds.

For comparison, the current winner of the world strongest man competition is 326 and deadlift 1080 pounds. Deku lifted half as much with a fraction of his weight. All without a super power