As a professional artist and writer - and lover of history, I have been following these 'ideas" for decades.
I hardly think Jesus would hold one of his male disciples in this manner - AND - there are 13 besides Jesus - ....
Here's another one with 13 besides Jesus - and a very female looking figure, with Jesus's hand on her shoulder - Oh, and no grail cup; by Crespi in 1500's
and a detail from the 1799 Last Supper by William Blake
P.S>
Just saw the movie - It followed he book faithfully - perhaps I liked it because I have been following the "ideas" for many years - so not as many 'surprises' - as "Oh yeahs" - good job on movie
I hope not. Except where he went into the weeds, I was fairly interested in some of the things he brought up. But frankly Dan Brown writes dialog like, well ...
Let's just say the script writers probably wish they hadn't sold out to Hollywood.