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No, It's established in my Fanon that momentary S Rank will cause the activation of OOA. The 'cheat bus' in ByakuShiki boost his sync level from B+ to A+, in order for this to happens easily.
Overshift is beyond that, requiring over S rank (a level previously unattainable), but the power output become so high that the I.S. frame can't handle it for a long time (90-120 seconds for first shift and 300 second for Second Shift)
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