Alnwick on Virtual Containment

I've been writing on Alnwick's theories of containment lately. He has three: exemplaric containment in the divine intellect, eminent/perfectional containment in the divine essence, and virtual containment in the divine omnipotence.  Here I am going to post some arguments he makes about virtual containment, one of those scholastic notions that has a neo-Platonic origin at least as far back as the pseudo-Dionysius (and therefore Proclus) and gets ridiculed from time to time today. The basic point from the pseudo-D. is that effects are contained in their cause in a more noble manner than they exist as effects. Scotus builds his notion of unitive containment on this notion, and several other versions of Dionysian containment were developed by other Scotists during the early fourteenth century.

The arguments Alnwick makes are meant to defend the claim that "the creatures contained in God virtually according to their perfection are distinguished from God really and formally". Recall that the various modes of containment are attempts to explain how and in what way creatures pre-exist in God prior to their creation.

Guillelmus de Alnwick, Quodlibet q. 8 (ed. Ledoux, 448-9):

Every positive perfection is contained in God formally or virtually; but the perfection of a creature, inasmuch as it is distinguished from God, is some positive perfection, because creatures are distinguished from God by their positive perfections; therefore, the perfection of a creature, inasmuch as it is distinguished from God, is contained in God virtually or formally. Not formally, for so then it would not be distinguished from God absolutely (simpliciter); therefore it is contained as such in God virtually. Then I arguo thus: the perfection of a creature, inasmuch as it is distinguished from God, is contained by God virtually, as now has been proved; therefore the perfection of a creature, inasmuch as it is contained in God virtually, is not the same as God. And so it is clear that the perfection of a creature, insofar as it is contained in God from the side of itself [ex parte sui], is not the same as God.

Again, fourth: whatever is produceable by some agent is contained in it virtually, because nothing is produced by something which is not contained first in its produtive power; but a stone according to its own proper nature is produceable by God; therefore a stone according to its own proper nature is contained in God virtually. But it is clear tha a stone according to its own proper nature is not God, therefore a stone, inasmuch as it is virtually contained in God, is not God but is distinguished from him.