Achieving success with SFI is an individual endeavor. A sponsor is merely a guide on how you will do your business. But along the way you can change your path on how you will achieve success.
A sponsor may also be new with SFI therefore he/she could not guide you. If a sponsor have been with SFI for a period of time then he may provide some guidance.
Bottom line make your sponsor a reference but do not rely your business solely to him/her.