Did the deck come with a book? Some deck creators are changing meanings, some do it slightly, some more. I look at the card and it seems to me, that the Morgan Greer 3 of coins would talk about a person who has mastered their craft, they do not need anyone to show them how to do the work. The person seems very independently working on something. So yes I would agree with you, that within the Morgan Greer Deck this card probably does not mean collaboration.
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