In reading the filing, I see no evidence that NC exercised his options at the grant date. They are marked 'exercisable immediately', but that does not meant he did so. These appear to be performance related. DS was also granted options. 50,000 with 25% exercisable in one year and than another 1/4 each ensuing year. Likely this was some similar arrangement with NC, but with his departure, vesting was granted currently and not prospectively.
I still believe that a new CEO name will surface soon. My guess is that the choice has been made but cannot be made public at this time - probably because of the persons current employment situation/contract. But that is just a guess.
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