Yes, an owner/worker who leaves get their share back, whether it has increased or decreased in value. A new worker has to buy in. I watched a documentary on YT

Yes, an owner/worker who leaves get their share back, whether it has increased or decreased in value. A new worker has to buy in. I watched a documentary on YT about Mondragon and a new employee talked about how he saved up the money so he could afford the shares to get a position at Mondragon.