GT never quite used "kid" Goku right. He was a little weaker, but never so weak where he couldn't handle everything in his path until Baby. And even then, Super Saiyan ... is too easy for Goku.

The official Dragon Ball site reveals one of the earliest original drawings from Akira Toriyama'smanga series, showcasing kid Goku concept art. After the introduction of the Super Saiyan ...