Identity

With the completion of the attributes that made up his identity, Ezra's ego now took those attributes to rebuild itself.

First things first, his name.

'I am Ezra Miller'. More importantly, 'I am no longer Kevin Reed'

The second announcement resounded, changing his existence fundamentally. 

Since day one he'd been meshing both characters together, but like water and oil, they stood together yet apart.

Both were names he claimed for recognition, which caused the problem.

What was his formal identity?

Previously, he'd unconsciously held it to be Kevin Reed as it was the obvious choice.

But now he could see clearly, he realized that holding up Kevin Reed as his formal name had him living in the past.

It had him evaluating the present with the past.

Now, he acknowledged having lived as Kevin Reed, but more so, he acknowledged that he had 'lived' it. 

Kevin Reed was no more, only Ezra Miller.

This declaration was the spark his soul needed.