There is an argument whether everyone should have a cup or just the seder leader as usually by kiddush. I think, it will depend on the reason for it. If the reason is because of sar hamashkin as explained above, then its only a symbolism, so it does not have to be felt and to have an enjoyment from it. However, when the reason as the Bavli is, arguing on the Yerushalmi, for the four expressions of redemptions then we were all involved and personal enjoyment is necessary. The GRA explains that the cup of Eliyahu is the fifth cup for the safek of vahevesi, I will bring you, which was temporary and Eliyahu will resolve. Tishbu it does not say Eliyahu. Maybe, the Chasam Sofer asks how can we rely on Eliyahu when the Torah does not reside in heaven? He answers that when Eliyahu appears as a human being, he is as good as everyone else. This being is implied by the person coming from his residence will answer all of our questions.
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