Was the painter a decision-maker?

[Koen G]

In those cases it looks more like the painter changed an intentional feature of the drawings to better match his expectations. So it's hard to say. Was this some guy messing up the other artist's images by wrongly assuming errors? Or maybe even the artist himself correcting his own work in the painting stage?

The presence of painting instructions seems to suggest that at least one painter was following orders. Although even here, these might have been "notes to self", I guess, though that seems less likely. There's also the fact that most of the visible color annotations have either been wrongly coloured or ignored.