The Song creators of the so-called Chan lineage 禪宗, with its list of twenty-eights patriarchs appearing in the Jingde chuandeng lu (1004), had to contend with the older and shorter list of twenty-three patriarchs which are listed in the Fu fazang yinyuan zhuan translated in 472 which says the transmission of the dharma was cut off when Aryasimha was beheaded. There are other lists which also present problems. But none of the patriarch lists, including the Fu fazang yinyuan zhuan mention a Chan lineage.
The Song Chan lineage uses various sources to create itself, including the Lanka lineage 楞伽宗 in which Gunabhadra, not Bodhidharma, is listed first. I would not be off base to say that when you put the so-called golden age of Zen under careful scrutiny, there is no Chan lineage. It is just Buddha dharma that is transmitted and even this doesn’t tally with the Pali Nikayas in which there is no transmission, not the sort accepted in various circles of Zen. In the Gopaka Moggallâna Sutta (M. iii. 7) just after the death of the Buddha, a minister (brahman Vassakara) of King Ajâtusattu Vedehiputta asks Ananda if the Buddha designated a successor. Ananda replies in the negative. About this particular sutta Thanissaro Bhikkhu notes:
This discourse presents a picture of life in the early Buddhist community shortly after the Buddha's passing away. On the one hand, it shows the relationship between the monastic community and the political powers that be: the monks are polite and courteous to political functionaries, but the existence of this discourse shows that they had no qualms about depicting those functionaries as a little dense. On the other hand, it shows that early Buddhist practice had no room for many practices that developed in later Buddhist traditions, such as appointed lineage holders, elected ecclesiastical heads, or the use of mental defilements as a basis for concentration practice.
Students of Zen should not hold works like the Jingde chuandeng lu to be sacrosanct. They are more like koan collections. In fact many koans are drawn from the Jingde chuandeng lu and other sources. The koan can be thought of as a literary tool for breaking down our nasty habit of looking for an intellectual solution to the Mind/dharma that is awakened to whereby one becomes Buddha. If one should be so lucky as to awaken to this recondite dharma they will also realize that Zen is a Chinese Buddhist literary methodology for awakening. It is the proper medicine for intellectuals.