This is a song kinda explaining more of how things work with the souls and why Ajax died.

Strings

I am tired of being your puppet
He says to the sky with a scowl
They found him dead
A bullet in his head
With sadness just four howled

This is what he meant
When he said that nothing mattered
Those 4 sat in silence for a while
But they soon forgot and yet chattered
I am no longer your puppet
Those were his last words
As he cut the strings
from his arms and his legs
He fell to the grass and the herbs

Go on, make him race
The greatest soul said, getting bored
The greater whimpered
They knew their place
Forced to kill him off as they mourned

Some
Thing
they did expect
Was that he figured out
their master's game
He knew about
the puppeteers and the puppets
So there he'd lie bleeding, dead in the
Rain

I am no longer your puppet
The last things that he whispered
He snipped the strings
from his arms, legs and life
"I'm free..." He murmured

Ajax died before the greater souls were forced to kill him. Cass was sent to the greater souls.