[Blog Post] An Allegory of Salvation (Koen Gheuens & Cary Rapaport)

[Searcher]

To be honest, I just don't see how the "grape" interpretation will change the previous suggestions about the souls and "aqua vita" conception. In fact, those details can be stones or grapes, or even just droplets, as all of them can represent Christ or his blood. Christ was frequently mentioned as a stone, grape, vine, a fish, etc. So, if they are just drops (of blood or water), it won't change the rest of your interpretation. If the left upper rosette shows Christ's Wound that pattern also can be just drops. 
I think your interpretation would make a great sense if the VMs would contain exclusively a religious context.  Of course, almost all medieval and late medieval treatises with different context were connected to religion, including astrological, alchemical and medical ones, as medieval society in general was very religious, but I really don't see the VMs as a merely religious text, as it is not proven visually, it doesn't look as such.