And that's what's wonderful: John gets his wish.

The burden of being the leader of humanity is (seemingly, at least for that moment) taken off of his shoulders (and placed onto Kyle's).

But now that John's there, will he just stand by and let his father die or everyone else?

Or will John become the leader he is and willingly take the burden back on his shoulders?

That's why John is the leader, the savior, of humanity.

It's no longer: "You have to do this, you have to be the leader, you have to take on this burden."

It's now: "I have to do this, I have to be the leader, I willingly take on this burden."