You are right mate, CZ doesn't need to gain back his position as a CEO for the exchange to function well. As the former CEO, he still have some contributions to make that will still help impact the exchange positively.
He can still remain influential and help guide the company to some better decisions off the records because his inputs brought the company far and is still valid.
Time in custody has definitely provided him some more clarity, as he has had more time to think away from distractions and disturbances.