I do agree with this. I think there's a reason Frontier chose 3 straight-up clones for this DLC...they didn't/couldn't spare the resources from PC2 and JWE3 to make a higher-effort DLC for PZ. So if they didn't choose flamingo/rhea they would choose another easier clone animal - think Guanaco or Brazilian Tapir - although they could have used the Crane rig and do a Sandhill Crane or something like that - but American Flamingo was higher requested than those others.
One clone that I think would have worked much better would be the Black Bear instead of the Coyote.
I would have swapped out the Coyote on the art for the Bighorn Sheep, blurred out the animals on the paper streamers, and shown a glimpse of the ABB on the poster with the Rhea(not a big fan of revealing 5 animals on the "teaser"). That would have softened the blow of not getting the Coati, while elevating the Bush Dog as a cool "surprise canine", and wouldn't require Frontier to have to put more resources into the DLC.