As Cousreslab supports SCORM 2004 it also supports a rathe cool function called SEQUENCING.
The way you have laid out your SCO and the path taken through it doen't have to be linear, this was a SCORM 1.2 constraint. You can infact have many sub organisations of the same SCO within the IMS manifest.
The sequencing can also vary on a rule based or driven basis.
Try the TASK CONTROLLER, for reference of how the SCORM 2004 'rules. for this work look here http://www.xerceo.com/snguide/