"...[Qutbuddin] said that Burhanuddin sent his sons to him and this was about ten years during his reign.  While he could not rememember the exact period they were his pupils, Qutbuddin added that they came to him from the time of the 51st Dai.  Qutbuddin also replied that, "if not all then many" persons of higher spiritual value knew he was made the mansoos (successor) and even offerred him sajda (prostration).  He said even Saifuddin and his brothers used to offer him sajda..." TOI - PG 07 - 25th August 2015