I can explain a few things here:
So, the Specials are all slated to get proper reworks and adjustments in time. What you see in the PotO update were to get them down to a baseline so that we can properly redesign stuff. What they have/do now is more of a temporary thing until we can properly examine them.
Aquarion was never meant to use Roads in the first place, and them being able to do so was a bug. We fixed the bug, so it's working as intended.
If whales go, Navalons go. That's just how it is.
Sometimes nerfs are just necessary.