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It wasn't just Pereira's power, it was his multi-faceted attack.
Both had high-accuracy, but Pereira was busier and more accurate (62% landed of 25 of 40, compared to Strickland's 15 of 29, or 51%).
More importantly, Pereira only actually threw 15 shots to the head, while the majority of his attack was on the body and legs.
Meanwhile, all Strickland did was jab, and throw occasional shots to the body. Easy read.
Go watch the fight again, the distraction of Pereira's multi-faceted attack
allowed for that feint jab, turned-into-a-left-hook which dropped Strickland, after which two finishing rights ended the stanza.
Strickland's style was amateurish, simple, and easy-to-read for the far superior tactician that is Pereira.
It wasn't just Pereira's power, it was his overall game plan and multi-dimensional ability.
His power was just the punctuation mark to end the deal.