It wasn’t retconned, it’s pretty ambiguous. There wouldn’t even be anything for ady to do about that.
the only real Rebels suggestion should be to put the Ghost into the space battle.
It is official cannon that that’s Rex now.
It’s not.
What we personally deem as canon aside, Pablo Hidalgo did confirm that as official canon.
Sure about that?
https://twitter.com/pablohidalgo/status/971414871337189376?s=20