BAPS does not change scriptures. I suggest you get off your laurals and read the scriptures written by Shriji Maharaj and It clearly say Akshar tai ne Purshotaam ni bhakti karvi. What does that mean? Akshar Purshotaam Upasana. Maharaj and His true Devotee.
Remember one thing: The reason BAPS has flourished and risen as a true Sanstha is because Shriji Maharaj is one with his gurus. If it was the same with the other sampraday's then they would be ahead of BAPS.
The only thing other sampraday's know how to do is go to people and tell them they are part of BAPS for donations. Use BAPS name ... But they have been caught out as everyone knows.