Ok so… let's say we pick a Sharkman who briefly unlocked the 100% of his brain. Now let's say that, in terms of brain capacity, humans are higher than Sharkmen. Returning to our picked Sharkman, the "100%" of brain capacity is the same maximum as a human's (like Lucy Miller). While on Sharkmen, it's more than their maximum. Sharkmen's maximum is lower than humans'.
What could be the picked Sharkman's power?
Enhanced Brain Capacity
Or
Maximum Brain Capacity