[Non-Sequitur]

So your theory is that the party, by possessing explicit right of admission, implicitly controls the right of departure?

Yes.

[4CJ]

4CJ: So your theory is that the party, by possessing explicit right of admission, implicitly controls the right of departure?

NS: Yes.

Well, then by the explicit power of a state to control it's assent to ratification (i.e. unilateral assent), IMPLICITLY each state controls the right to depart by the same means - an act of the people of that state in convention.