1-factor authentication in the Matrix

I just remembered the way Seraph tells Neo in the Matrix "You do not truly know someone until you fight them." and I was trying to sort the fight that follows into one of the typical categories of authentication:

1. Check what someone has.
2. Check what someone knows.
3. Check what someone is.

when I realized that in the precise context of the Matrix, in the case of Neo, categories 2 and 3 are the very same.

• Neo is the One because he knows he is the One.
• Being the One, Neo knows he is the best kung fu fighter.
• Knowing he is the best kung fu fighter, Neo is the best kung fu fighter.

He is because he knows and he knows because he is. Seraph indeed performs a 1-factor only authentication to check Neo is the One.

-+- The little joys of security-thinking ! -+-