[Third Person POV],
Ace was able to level up to level 40 thanks to the primordial records he obtained from eliminating many mutant rats. This allowed him to kill mutant rats that were 6–7 levels below him, but even this just made it slightly simpler for Ace.
Even though Ace was just one level beneath Andrew Dawn, this did not indicate that he was on a par with Andrew Dawn or even remotely equal to him because Ace was still unranked.
Even when he was four levels or above Andrew Dawn's men, his physical powers were still slightly incomparable to theirs.
What separates a ranked creature from an unranked creature are jobs, the grade of the jobs, and the enhancements they provide to the owner when and after evolving.
For one, Ace lacked any of these, therefore the only edge he had over some highly ranked species was the level difference, and even this was simply to prevent him from getting terribly beaten.