kelgorath, taken from bones

if kelgorath is returning this season as taken, and he works for xivu, does this mean xivu has learned the ability to take?

only other scenario is that the leaked lore tab explicitly states xivu is working for witness directly, so maybe witness took kelgorath for xivu, but this season is so heavily xivu focused that seems weird

EDIT: https://www.destinypedia.com/Darkblade_Kelgorath,_Risen_from_Bones

it seems Rathkrin, a wizard on Xivu’s war court uses a piece of Oryx’s sword in agreement with Kelgorath to Take him, in a lore tab on this seasons strand glaive