Honestly at this point I feel like our character is just living the "life" of the Warrior of Light through their own Echo similar to how in 1.0 the Player character was in the past experiencing past events from the perspective of another person due to the Echo.

It would make more sense if "party members" are canon that they are other Echo users viewing events of the WoL's life with the Player's character.

It would also explain why the WoL's life been so linear in story since through the Echo we are only experiencing the past in the WoL's place.