Then nothing in the Old Testament can be a prelude to Christ since it was years before the incarnation.
Your old Logic teachers called.
..said something about a refresher course?
You regretfully ignored the main point of my argument and took the snippet that focuses on the time. The point is that John does not mention the Lords Table in the Upper Room discourse.
Since the events were a year before the institution, John 6 COULD be what you say ...
But the simple fact that John omits the institution demands the conclusion that John 6 cannot be a foreshadowing of the events.
You as a RC will simply have to study the text more diligently to develop a cogent explanation.