Originally Posted by
Jackstraw
No.
As I said, the earliest are probably Troll daemonics which predate the Kaldorei.
There is no base in the Kaldorei to trace what the Demon Hunters do to get their powers. The enslavement, bending and otherwise consumption are elements actively shunned by the Kaldorei culture as a whole, shown only in the degradation of Eldre'thalas.
And as Tanaria said, Kayn is as Illidari as it gets. Altruis is the "separatist", and the more adhering to the Illidari ethos is a Blood elf who does not see himself as a Blood elf, as Horde or as anything that's not Illidari. In the Legion flashbacks we see Illidan consuming his comrades as an extreme measure, but Illidan was a renegade and operated as one, separated by his own culture.