Thus, several peak humans end up with Master Roshi in the DB universe. They can develop Ki powers such as Krillin and Tien and Yamacha did. How do they end up on the power levels? Saiyans and others seem to have intrinsic, genetic better power levels but how do these folks do?
Ollie from Arrow
Doc Savage
Standard Batman
Steve Rogers
Daredevil
For fun, Kimball Kinnison - not a normal human, finishes Gray Lensman training with the Arisians who then send him to post Graduate School with Roshi.
If they do well, send them up to King Kai.
How does it turn out?