this... is not how I remember it... and team four star kuririn depiction has not helped, tien comes more to mind but then I actually see his forehead
Krillin's actually one of the strongest humans in the Dragonball world. It's just that the Saiyans and pretty much every new damned villain to come along are so much stronger than he is. That's the problem with being Overshadowed By Awesome (not to mention having a bad case of not being able to catch up to the others in power).