Bob Satterfield proves size doesn't always matter:

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man that is impressive

and how many times jeffries , jack johnson , carnerra , louis , liston , ali , foreman , holmes , lewis , wladimir klitschko , vitali klitschko , paul williams , kelly pavlik , chad dawson , antonio tarver , michael spinks , juan carlos gomez , carlos monzon , thomas hearns , alexis arguello , oscar delahoya , bernard hopkins and many more proved that size does matter ?
oops , i forgot bowe and holyfield himself in both his tyson fights and qawi fights . but then again , even if i will add further 100 people to that list , it will still be just the minority of examples.

and how many times jeffries , jack johnson , carnerra , louis , liston , ali , foreman , holmes , lewis , wladimir klitschko , vitali klitschko , paul williams , kelly pavlik , chad dawson , antonio tarver , michael spinks , juan carlos gomez , carlos monzon , thomas hearns , alexis arguello , oscar delahoya , bernard hopkins and many more proved that size does matter ?
oops , i forgot bowe and holyfield himself in both his tyson fights and qawi fights . but then again , even if i will add further 100 people to that list , it will still be just the minority of examples.

Greb proved that size didn't matter time and time again when he beat all the top LHW and HWs of his time whilst coming in at MW. Dempsey got his ass handed to him in sparring and ducker him thereafter.

Nino Valdes stops Hurricane Jackson:

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Another light heavyweight vs heavyweight match-up, this time it's Archie Moore fighting Nino Valdes:

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Greb proved that size didn't matter time and time again when he beat all the top LHW and HWs of his time whilst coming in at MW. Dempsey got his ass handed to him in sparring and ducker him thereafter.

but how many examples justify my claim and how many disprove it ?
greb was schooled most of the times against tunney.
why is that ? b/c greb was less talented than tunney ?

but how many examples justify my claim and how many disprove it ?

For something to be true (technically a tautology), it must hold true for every example. For something to be false it only needs to be demonstrated as wrong in one example. That's how pure mathematical logic works. The example I cited proves that what you stated is false.

greb was schooled most of the times against tunney.
why is that ? b/c greb was less talented than tunney ?

No, most likely it's because Greb was blind in one eye. DOH!

(Furthermore a couple of those decisions were contentious ones...)

Great videos, thanks.