First, the owner payed credits to open the CC, thus the wording deems appropriate.
Second, he holds the full executive power, can only delegate minor parts of it - like a medeval owner ;)
He just don't own the members which are free to stay or leave...
This executive power includes the option to hand ownership to so. else. This inevitably must be initiated by the owner from inside his owner tools. We have never heard that WGT would have meddled with the ownership of any client or CC.
Your owner has been inactive for 18 months - there's only a wee chance to reach him by mail or with a post on his wall (which would be transferred via his email).
You may keep the CC alive with the help of active members and directors, but you'd never be able to purge members (maybe not even accept new ones?) I just hope that there's someone left to create tournaments(?)
Would be a pity to lose a L11 CC, but this may be it's fate - someone may have to open a new one and invite his friends to join him.