"...we don't put any stock in any number other than what the monitor ultimately determines is the actual percentage that remains. "

Litterally speaking "ultimately" means "finally, in the end" so perhaps for now the definitive % is not established but not less than 12 1/2% is my interpretation.

So here is the area  Gowling may look at for change upward.  It may also be here Gowling is looking for that "more than" surplus that they make their money on the opt-ins.