It's also on all the drakes in my collection. Including the Ony drake.
If you don't have one, you might not be aware that the spikes stretch in all kinds of distracting and odd ways. They still do, but in different odd ways. The elbows seem to be different too. So there may be some deliberate fiddling with the drake models going on. At least an attempt to correct some of the weirdness with the Ony drake seems to be happening.
I just threw this together, so I'm not sure you see the back and spikes so well.

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