By "odd," I mean that the base unit has a pair of upgrades, and each creature in the upgrade pair also has its own pair. Or, did you manage to make it so that instead of a pair of options, three are displayed for selection?!
No, I haven't tried making three options, which is why I wrote above that it would be interesting to try in the future with the Behemoths, if I get permission to use them, but I don't know where to find the author's topic about the Behemoths.