Is the cup an implicit reference to Golgotha?

[Giuseppe]

Then he took a cup, and when he had given thanks, he gave it to them, and they all drank from it.

(Mark 14:23)

It is expected that this cup should have a round form.

For this reason too the cranium is called gulgoleth, because of its being nearly round. Because every sphere rolls rapidly, every spherical thing was called galgal. Hence the heavens were called galgallim because of their being round - I mean, because of their being spherical.

(Maimonides, The Guide of the Perplexed)

But then note the irony: the disciples are drinking from this cup, during the Last Supper.

While on the real “cup” (=Golgotha), the Jesus has to drink, for a misunderstanding about the his real function:

Someone ran, filled a sponge with wine vinegar, put it on a staff, and offered it to Jesus to drink.“Now leave him alone. Let’s see if Elijah comes to take him down,” he said.

(Mark 15:36)

So Jesus predicted, during the Last Supper, that he would have offered to drink his blood on a real “cup”, the Golgotha or “Place of Skull”.

[Giuseppe]

A possible suggestion is the following:

during the Last Supper, Jesus is saying that the real victim is not precisely him, but the respective material symbols he is giving in the place of the his blood and the his flesh: the wine and the bread. If it is the spiritual Christ who is speaking here via the man Jesus (since the latter is possessed by the former), then the same distinction between the Giver (the Christ) and the real Victim (the Jesus) is at work on the Golgotha: the mere man Jesus is going to be given as the “real” Victim (precisely as the Eucharistic bread and wine), while the allegorized victim, the Christ, is simply seeing the scene from above.

As the logic goes, the spiritual Christ has to die, also, since the earthly crucifixion of Jesus on the Golgotha is only a symbol of the sacrifice of the Christ, just as the giving of bread and wine is only a symbol of the sacrifice of Jesus.

In terms of a divine proportion:

the giving of bread and wine (symbol) : the death of man Jesus (fact) == the death of the man Jesus (symbol) : the Death of the spiritual Christ (FACT).

So we know where the Death of the spiritual Christ happened really: in the heaven.