Ive never heard the term glass cannon in nearly 40 yrs of following the sport but I dont consider Norton or Morrison to be guys that "could beat anyone" or that had the combination of "overwhelming speed, power, and combinations"
That's because it's not a boxing term: http://www.urbandictionary.com/define.php?term=glass cannon It's a gaming term. It's actually quite descriptive, I thought.
Hearns no.. Beat Cuevas, Benitez, Duran, Hill and was in great fights. A glass cannon would be had he lost to Cuevas, not knocked him out in 2 rounds.. or Hill and Benitez.. outboxedboth and knocked out Duran.
I guess I never really asked were I first heard the term. But , it comes to mind when talking about some boxers.
Kudryashov is the very definition of this. There's yet to be a fight of his that's lasted the distance. Massive power to upset those better skilled than him, vulnerable enough to get knocked out by those worse than him. Other names I haven't seen mentioned that fit the term to a varying degree- -Duane Bobick. 42 KO's in 48 wins, all 4 losses by KO. -Chakhkiev. (even if conditioning/poor pacing was a factor in his KO losses, I think he fits the bill) -Deontay Wilder. -Jhonny Gonzalez. He's been in some slugfests & taking 4 KO losses in 74 fights isn't "glass" worthy, but worth a mention.
Oleg Maskaev. Good technique, power, speed. Looked legit until he met someone good enough to test his chin.