TPS and structured organizations

There is some brewing debate within my organization regarding the implementation of TPS and how the leadership structure must be organized.

We are attempting to implement our tweaked version of the Toyota Production System while using the "star points" self-directed work team structure. i.e. we don't have supervisors or team leaders like Toyota.

Personally, I am not sold on this structure as of yet. I am interested in others' experience regarding org. structure and TPS implementation.