Looking technically, there could be a soft corner or two in those specific examples that would withhold 9 grades, but be that as it may, I concur with the point you're getting at, which is that those are the sorts of cards that may not be straight 9s only due to centering, and therefore are candidates for being slabbed however the submitter prefers, either straight or with the "OC"...
But my personal opinion is still that the "OC" label is more gimmicky and problem causing than it is useful. Maybe this is best illustrated by musing: why just OC, why stop there? They could have a "9DC", which would mean, 'this would be a 9 except for the several dinged corners', or worse is getting hit with the dreaded "9RC", which would be the same but accounts for having rounded corners!
To me if something doesn't meet the grade definition, then it doesn't meet it. There's no sense in having an endless serious of "this is the number we would give it, except for this [fill in the blank flaw] that makes it absolutely and definitely not that number". That's what those sorts of qualifiers are, and my opinion is that that's a goofy way to approach the issue of formal grading.
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