That same taken servitor is still bugged, i got all the motes from the visions of the traveler and also got a mote from all the other bosses, to confirm that, if i do the overthrow at the other two locations beside the blooming the bosses rotate, but only in the blooming its always the taken eye. Update: The grimoire to kill all 3 bosses was not counting the 8x i killed the taken eye boss, but as soon as i did it on that matchmaking mode of overthrow it worked and i finally got my last mote.