The Kinetic (moving)energy of an object is determined as 1/2 Mass X velocity X velocity.
So the speed of a moving mass (a boxing glove and arm) greatly effects the amount of kinetic energy that the head must absorb
The damage (KO) is due to the quick acceleration of the skull,and the resultant concussion between the now moving skull and the still motionless brain.
Tyson had fast punches..no doubt.
BUT theres more to it, the force BEHIND the fist that still pushes the punch forward as it imparts energy to the head.
Technique is a big part as well, utilising the whole body in the delivery,
strong weightlifters can't throw footballs or baseballs very far.
Maybe the word "HARD" is the issue here

adjective: very strong or vigorous (Example: "A hard left to the chin")
adjective: dried out (Example: "Hard dry rolls left over from the day before")
adjective: unfortunate or hard to bear (Example: "Had hard luck")
adjective: not yielding to pressure or easily penetrated (Example: "Hard as rock")
adjective: metaphorically hard (Example: "A hard fate")
adjective: of speech sounds
adjective: having a high alcoholic content (Example: "Hard liquor")
adjective: having undergone fermentation (Example: "Hard cider")
adjective: not easy; requiring great physical or mental effort to accomplish or comprehend or endure (Example: "Why is it so hard for you to keep a secret?")
adjective: characterized by toilsome effort to the point of exhaustion; especially physical effort (Example: "Hard labor")
adverb: with effort or force or vigor (Example: "The team played hard")
adverb: to the full extent possible; all the way (Example: "Hard alee")
adverb: slowly and with difficulty (Example: "Prejudices die hard")
adverb: causing great damage or hardship (Example: "Industries hit hard by the depression")
adverb: with firmness (Example: "Held hard to the railing")
adverb: earnestly or intently (Example: "Thought hard about it")
adverb: with pain or distress or bitterness (Example: "He took the rejection very hard")
adverb: very near or close in space or time (Example: "It stands hard by the railroad tracks")
adverb: into a solid condition (Example: "Concrete that sets hard within a few hours")
adverb: indulging excessively

Seems to me Both Tyson and Foreman...though very different in the methodology, realised the same result!

CAN A CASE BE MADE? yes.