The above link is reference for those unfamiliar with the Ancient Triptych message.
Stanzas of Dzyan - Theosophy wiki
38. Thus two by two on the seven zones, the Third Race gave birth to the Fourth-Race men; the gods became no-gods; the sura became a-sura.
39. The first, on every zone, was moon-coloured; the second yellow like gold; the third red; the fourth brown, which became black with sin. The first seven human shoots were all of one complexion. The next seven began mixing.
40. Then the Fourth became tall with pride. We are the kings, it was said; we are the gods.
41. They took wives fair to look upon. Wives from the mindless, the narrow-headed. They bred monsters. Wicked demons, male and female, also Khado (dakini), with little minds.
42. they built temples for the human body. Male and female they worshipped. Then the Third Eye acted no longer.
IMO ...researchers connecting the 3rd Eye access with the Triptych message are correct.
With the 3rd Eye decline in access....
A teaching message was required by the People to Join with the Eternal Oneness via Socio
Constructions and ritual.
One question to ask concerning the Denisovans and their Spiritual maturity,
Would be if they experienced the access of the 3rd Eye?