Claim: The original version of Kid Supreme was a teenager named Alex Smith, and he avoided the battle between Supreme and Union, but the person he met while escaping the battle gave him super-powers.
Evidence: The first Kid Supreme was Charles Flanders, a boy who could tap into Supreme's powers. 
There have been three versions of the character: Charles Flanders, a World-War-II-era sidekick of Supreme, who could tap into the hero's powers; Danny Fuller, who received super powers during a fight between Supreme and Union; and a younger version of Supreme (known as Supreme-Mite as a toddler) written by Alan Moore as an homage to Superboy. 
Supreme (Vol. 2) #9 (1993) (Charles Flanders)