My theory about the medical records is that the records that were stolen by Lil bro and Ji Fan were not the real records. As Wufeng spy, Lady Ming Wuji could have already predicted that the record would be stolen and maybe she told A'yun about it. For which, A'yun set this whole plan to track GSJ and his bride. It also implies she acted weak and was defeated as she's still pretending to be a Chi. The real record is with her and now she's protected by the guards Ji Fan put around her. This would kill 3 or 4 birds at the same time.
Other theory regarding this would be that she copied the medical records after getting the book from Ji Fan and the copy that is right now with GSJ is actually a false, slightly modified record.
Theory about Ji Fan being a Red Guardian was true!
But I was wrong about who put Ji Fan there it seems since they showed his father the SW did that. However we can see that all 3 Elders were present when the decision was made and so this still explains why they are making so many concessions for Ziyu.