I prefer to be more careful.
The different faces of the two Aries and the two Taurus may well be evidence of two different draftsmen. I can't say.
However, for all the emendations (and suspected emendations) that appear in the text and in the drawings there is no way of telling how much later they were made, or by whom.
It is speculation, but entirely possible, that they were made by the original scribe, on the next day, after going over the dried results of his efforts and noticing that there were either mistakes or parts that did not come out clearly (i.e. they were emphasised using new ink).
Other scenarios are possible, including much later emendations by later owners, but I don't see how this can be demonstrated either way.
I think one should not base grand theories upon such speculative arguments (as a general rule, and not intended as criticism of any reader/writer here).
The different faces of the two Aries and the two Taurus may well be evidence of two different draftsmen. I can't say.
However, for all the emendations (and suspected emendations) that appear in the text and in the drawings there is no way of telling how much later they were made, or by whom.
It is speculation, but entirely possible, that they were made by the original scribe, on the next day, after going over the dried results of his efforts and noticing that there were either mistakes or parts that did not come out clearly (i.e. they were emphasised using new ink).
Other scenarios are possible, including much later emendations by later owners, but I don't see how this can be demonstrated either way.
I think one should not base grand theories upon such speculative arguments (as a general rule, and not intended as criticism of any reader/writer here).