User blog comment:Oknight/Superboy and Superman/@comment-383786-20120509150100

Somebody actually pointed this out on Ask Greg. Weisman replied that they just went with a dynamic that felt right for the show. Besides, you're talking about a four-month old (as of Independance Day) clone of an alien with superpowers. It shouldn't be that hard to suspend your disbelief. Frankly, I thing you're being nit-picky.