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Hi @juliendargaisse,
I’m afraid we’re not familiar with that theme, so we couldn’t tell for sure. From what I can see, a “Listing” is a custom post type, so I can tell you will need Molongui Authorship Pro in order to be able to enable the co-authors feature on them.
If listings behave like regular posts, you should be able to add multiple authors to them and those authors (being them WP users) should be able to edit it (as long as their user role allow edition, obviously).
Hope this helps!
I’m closing this ticket now, but feel free to re-open it if you need further assistance.