End of A Journey

Yggdrasil stood tall and mighty, overlooking the worlds below it. On one of its branches sat a confused young man by a being that rivaled gods. The words the Spirits Sovereign left Arthur with more questions. 

'I made that choice before?' 

The fact sat down beside him on the branch, alienating and refusing to sink into his mind. It wasn't something he could easily accept because that implied many things, and it revealed a lot more. 

'The person whom the Sovereign compared me to must be the First Seeker, the man who found the Spirits Realm and bargained his ability to feel for the empowerment of the human race.' 

This fact, concluded by the Sovereign's unelaborated words, proposed one further question: was Jizo the first seeker, and who the Sovereign talked about?