I didnt understand your argument.
Every person has a single will. We agree in that, right?
God has a single will. So He is only one person.
In an over-simplified view of God and on the assumption that Jesus' was not also living incarnate, having to also reveal to others the devotion they should have, and also conforming his will in his humanness, you might have a point. I would prefer to work out the details in light of the uniqueness of God and the situation of the incarnation of the Son to be among us.