Actually, Beau was given a mandate for Guy to have super powers but the Vuldarian idea was his. He felt it would explain Guy's personality and allow it to develop. Why Guy always claimed he was the "one" true GL and why he was always searching, like a salmon swimming upstream. It was his Vuldarian heritage and his being the last of a kind. So while it was an editorial mandate, it was all his idea. He wanted Guy to be a Nine feet behemoth that rivaled superman in strength and was the best warrior, best hand-to hand, best marital artist in the universe, the last of a race before the Guaridans, Darkstars, etc. that just the name Vuldarian use to make those bad guys in the ancient past fill their pants.
I thought it was cool, and the first time Guy became more than a jerk with a bowl cut and a one trick pony with a GL ring.