Ducks can't kill Ronin. And the factory swap doesn't work at all.

I don't see the point in playing Amph at all because of the Cloak counterpick

I think Ronins and Buoys are about even.
I think Reavers forces out something heavier than Ducks like Buoys, but the cloaky player can choose between protecting their Ronins against Ducks using Glaives or Reavers.