It may be that A and B, assuming they had a lock on certain PNMs, elected to under invite to pref and it backfired on them. That has happened as well. But yes, ANY chapter that does not make quota can COB to quota. It is one of the Unanimous Agreements to which ALL NPC groups and CPHs must adhere. See the MOI (Green Book) for this quote:
"Each NPC fraternity chapter has the right to COB to reach quota or its total allowable chapter size during the regular school year as defined by the school calendar."
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