Normally the developer runs the HOA until they sell the last unit. An election before they sell at least half the units would be pointless - they own the majority beneficial interest. But usually they hold control until the last unit sells in case they need to do something like fix an error in the condo docs.

Now that he is no longer a majority owner the other owners can and should call for an election and oust him. And they can self manage or put the contract out to bid and hire a management company.

OP: read your condo docs. They’re usually quite readable. If you arent sure about anything you can check with your closing attorney about what you can or should do - you paid them to review all this before closing.