To get a E2 visa YOU yourself have to be a substantial investor in the business - not just an employee.
Those are the rules....
I can prove you I am here on an E2 and I can assure you I haven't invested a dollar into the US economy, except for regular income taxes. It's all been taken care of professionally by an immigration lawyer that my flight school is using and the application has been approved for me and many of my colleagues. Regardless what the regulations say...