As per my understanding your using ring topology to connect Cisco switches. so there is no "in or out" its depend on the STP port forwarding and blocking, one side should be in forwarding another side will be in blocking.
Flow should be as follows;
Main switch Forwarding---> 2960-01 <-->2960-02 <--> 2960-03 <--> 2960-04 <--- Blocking Main switch
Hope I will be able to answer your question.
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