Is Castiel Really The Cosmic Empty Entity?

Fans of the show might remember that an entity governs the Empty, a place where nothing exists, even before God.

This is the final resting place for deceased angels and demons. As ludicrous as it may be, the Empty is an eternal resting ground for those who one would think do not perish.

Castiel is simply an angel, but is it he who is actually the Lord who controls the Empty? It just may be so, remember in The Big Empty episode, the moment Castiel awakens from Jack's call, the entity also wakes up. Castiel is also able to sense the entity. Now, this might be just Castiel's own intuition, or the entity and Castiel have a special type of bond. The entity also talks to Castiel from Castiel's form. There is a bond between the two beings, and it wouldn't be out of place to suggest they are one and the same being.