About Gaudiya Vaishnavism

There are four major vaishanav sampradayas & gaudiya Vaishnavism is one of them. As per the definition gaudiya Vaishnav is krishna centric sampraday. But I have seen different versions of it. Some are krishna centric & some are Radha centric.Like isckon they bearly recognise Radha rani & have only her sri vigrah in temple. They don't talk about her much & also there is so much controversy in isckon related to her because according to them it is unacceptable to call radhe radhe or greet someone by saying radhe radhe but I have seen many gaudiyas who are more lean towards Radha rani. So i want to know what's the moola sidhant of gaudiya Vaishnavism