Well, I'm just differentiating between things that are possible and things I find the most likely. When handwriting variation like this is found in different manuscripts, the standard assumption is multiple scribes. Which happens very often, by the way. Number of hands is one of the categories you'll often encounter in catalogue descriptions.
Standard assumption does not mean "I see absolutely no scenario where this is the case".
Standard assumption does not mean "I see absolutely no scenario where this is the case".