You may have to expand the business, but reviewing the business would be necessary. The actual employment creation is really a concern for the I-829 stage of the process. It is understood that at the time of filing the I-526, you may still be in the very early stages of operating the business.
You ask very interesting and thought provoking questions which will require you to retain the assistance of an experienced EB-5 attorney. First, there is a difference in investing in an existing troubled business and maintaining the current number of employees and investing in an existing business that is not troubled and creating new additional full time employees.