Full Idea
Pre-theoretically it does not seem to be the case that what is essential to a thing includes everything that is necessarily true of that thing.
Gist of Idea
The essence of a thing need not include everything that is necessarily true of it
Source
George Molnar (Powers [1998], 1.4.4)
Book Reference
Molnar,George: 'Powers: a study in metaphysics', ed/tr. Mumford,Stephen [OUP 2003], p.37
A Reaction
This seems to me to be true. The simple point, which I take to be obvious, is that essential properties must at the very least be in some way important, whereas necessities can be trivial. I favour the idea that the essences create the necessities.