If I remember correctly, the statue of Nokris is up front and to the right of the Oryx statue; Crota being to the left. This leaves me to believe Crota and Nokris are siblings, children to Oryx. We learn through the fragments that Oryx created Crota, but cut the second larvae in half with Willbreaker. Could it be possible Nokris was the name of this child before being split into the twin sisters?