410(b) Problem Due to Participants w/$0 Compensation?

[mming]

The sponsor is a construction firm who keeps many employees "on call" , sometimes for over a year, until their services are needed. They are reported as employees with zero compensation and no hours worked during these periods, but not terminated. Many of these employees became participants in the PS plan during the previous year, but will not be receiving an allocation for this year due to their lack of compensation. If they had a compensation, they would get an allocation since the plan uses new comparability and they would be eligible for a gateway allocation (plan is top heavy). If they are considered not benefitting, 410(b) fails. I suppose one way to avoid this is to have the employer consider them terminated during the year so they wouldn't be entitled to the gateway amount, but if the only reason they're not getting an allocation is a lack of compensation, can one say they are "benefitting" in a twisted, yet legal, way? Has anyone seen this type of situation before?

[Bird]

They're not in the test.