Well from where I am in the Making book, Boba really started as Vader..they were balled up in the same character. Vader was the big baddie, but was a bounty hunter. Vader became the black knight, then Boba was kindof branched off as a dark sith lord minion sortof, called Prince Valorum, black knight of the Sith (sound familiar). Then he morphed into the bounty hunter employed by Vader. This is all A New Hope when it was Luke Starkiller & the Journal of the Whills. Then when Empire came about they wanted a squad of super stormtroopers (hence the supertrooper name and white/black costume) to hunt down Luke. So the Prince and the supertrooper merged. Lucas then chose to feature fett in the Holiday Special and as a promo tool, so they rushed and created him. The drawings of the Prince Valorum are dated 1975, supertrooper concept buckets Oct 77.