Essence is abstract. You cannot say Christ is an abstract, from abstracts, or in abstracts.Are you saying the Trinity is one in abstraction? That Christ is in abstraction with us and in abstraction with the Father?
The way I understand it, an essence was something abstract to describe what an actual tangible thing (hypostasis) is made of. To say that the Father, Son, and Holy Spirit united in one essence does not mean there's a thing called divinity, from which Father, Son, and Holy Spirit were molded from. Rather, Father, Son, and Holy Spirit, their divinity is essentially the same, while their unity is in the Father, which is a personal unity.
Likewise with Christ's humanity, being essentially the same as us. But Christ did not "become humanity", but He "became man". I am not Christianity, I am a Christian. Etc.