Kasparov's invention to help other humans use the rift fails, but other humans can now use them?

Recently made my third character and noticed Kasparov actually fails in making that device he intended to use for allowing other humans to pass through the riftgates. However, right after that, he tells me to look for his apprentice and that I can just have people go through the riftgates. Did I miss something or doesn’t that contradict what happened a moment before?

Your character gains the ability to allow other things to go through riftgates when he/she becomes a Taken.

Doesn’t “Taken” stand for something like “under possession”?

Taken means someone possessed by any Aetherial in the lore of the game. There’s still aetherial energy left by the aetherial in your character, this allows your character to use the riftgates and allow others to use them.

Aetherial altered main character neural and other physiology to suit its needs. That includes creating and using riftgates at will. Skills at their basic level is not something that can be separated from neural tissue and thus can not be removed. So after aetherial leaving, character still keeps the skills.