Twice today I banked 10 motes which summoned the primeavel. Both times there was less than 10 motes needed to summon. I still sent the medium blocker, but neither time did count towards the blockade bounty(bank motes for a small, medium, and large blocker).
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I could be wrong, but I think it only counts up to the bank max. So if the bank was at 68 and if you had 10, I think it would bank 7...and send a small blocker. I know I've banked last, and the feed has shown fewer motes than what I had. I am relatively new to Gambit though.