Why do they use "quantum leap"? A quantum leap is actually a very small movement.
While a quantum is indeed a tiny increment of energy, a quantum leap refers to the discontinuous change of an electron within an atom from one energy state to the next. That is, it "skips over" the intermediate quantum, which flew in the face of older theories which proposed that energy always changed continuously.
Hence, a quantum leap now simply refers to any sudden large advance. Bobby Orr was a quantum leap in the role of the defenseman, because despite offensively gifted defensemen like Harvey and Kelly, there was nothing to suggest that a blueliner would lead the league in scoring in a few short years.
So this article isn't merely using big words for their own sake.