I was told by a GW Black Shirt that the Sensei ( children born of the Emperor's Loins), had been written out of the 40K Fluff, but other like Malcador, who everyone back in 1st and 2nd edition believed was one of the Emperor's favourite Sensei is still in the Fluff.
I had planned to build a whole counts as Grey Knights, Chapter of Gene splice (by Fabius Bile) Word Bearer/Sensei Hybrids, equipped with reverse engineered Grey Knight weaponry (they have 2 dark Mechanicum Words that owe allegiance to them in the Eye of terror).
Well the story seemed fool proof, and easily a great backgroud story for when I finally get around to building and painting them for competitions.
Does anyone know if the Sensei are still in the 40K Fluff?