Unused units from SC1/brood war

As far as I can tell, there are only 2 units from SC1 that aren't available for use by coop commanders - the valkyrie and the defiler. And the shuttle I guess, but noone cares about the shuttle. So I was thinking which commander these units would fit best with, and here are my thoughts:

Valkyrie - I really feel that Stukov should have had infested valkyries rather than infested liberators. The unit was introduced in BW along with Stukov himself, they speak Russian just like Stukov, and they perform the same anti air function that infested liberators do in coop.

Defiler - I think this would fit best with Zagara. Her zerglings, banelings and aberrations are all melee so would synergise very well with dark swarm, allowing them to get into melee range safely. This might help her with certain mutations that she struggles with. Also plague is just an awesome spell and it would be great to see it in coop.

What do you think?