Does Eternal Subordination Entail a Denial of Homoousion?

In tonight’s debate, McCall and Yandell tried to make the case that the eternal subordination of the Son to the Father entails a denial of homoousion.
The Argument
Here’s their argument:

If the Son is eternally subordinate to the Father in all possible worlds, then the Son is necessarily subordinate to the Father.
If the Son is necessarily subordinate [...]

My Question for Dr. Yandell

My good friend Andy Naselli is sitting on the front row watching and live blogging the debate. He asked me if I wanted to ask a question, so I sent this:
If the Son is necessarily the Son and the Father is necessarily not the Son, then the Son is essentially the Son and the Father is [...]