No, that's cheese. You can tell by you use of the words "to avoid the rest of the mechanics", or in other words, bypassing intended mechanics.
That's cheese.
English
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Killing Crota in one damage phase so that the Ogres don’t spawn isn’t a cheese.
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"So that the Ogres don't spawn" You mean bypassing intended mechanics?
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If they were intended to the point where killing Crota with one sword shouldn’t be possible, we shouldn’t have been able to kill Crota so quickly.
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Never said that cheese shouldn't be possible. Quite the opposite, cheese is just something that's easier than intended. It only became possible to kill him in one sword once we became over powered. That's when it became cheese, not when we did the raid at the intended level.