This is clearly a politically motivated move; traditionally Bon had been classified as Shamanism practice by Tibetan Buddhist scholar. Why does DL need to seek friendly diplomatic relationship with the Bonpo, Nyingmapa, Kagyupa and Shakya?
DL had been 79 years old by age, as we know, there are no influential scholars from his institution for him to pass the baton down to. In political front with China after his passing, if there is one reincarnation being recognized by his institution, China could retaliate by having another one or more!
Domestically within the Tibetan Buddhism sects(the nangpa) , the rift between Gelugpa and the other three sects and been long on going especially with the Kagyupa during the reign of the Great Fifth, which resulted 7000 monks, abbot and scholars of the Kaygu linage being prosecuted except the Karmapa and his attendant. Leading to the Karmapa went into exile for the next 30 years.
Within Gelug institution, His series of political moves recently in allying and reconciling with the Shakya,Nyingma and Kagyu in major events and now bringing in the Bon into the “nangpa”(the insider) was just to alienate what deem as a threat to his reign of power, the Shugden practitioner and their linage masters!
Since the Fifth DL, this had been the practice to seize absolute power from within the Gelug institution by appointing who should be Gaden Tripa and his regent Sonam Choephel was assign to take charge of secular affair.
The current DL appointment of CTA on secular affair while he acts as spiritual leader is similar to that of the Fifth era. This causes so much of disharmonies among the Tibetans, to the extent of waging war against each other.
“Before that the Dalai Lama were spiritual lineage tulkus of the Lama Tsongkhapa's direct disciple, Gendun Drup. But since he is the one who appoints the Ganden Tripa ie the seat of Lama Tsongkhapa doesn't that make the Dalai Lama "higher" than the Ganden Tripa?”
To my opinion, this was akin to as saying who and how Je Tsongkapha should be and DL had even putting his hand into the process of recognizing candidates of reincarnation of Karmapa!
Before more damages being allowed to continue, it is the urgency that we Shugden practitioners stay united to lift the ban immediately to restore harmony within Vajrayana Buddhism so that each can practice their respective linage doctrines freely.