metis
aged ecumenical anthropologist
Maybe yes and maybe no.Jesus is thus imagined here as creating a new Passover ritual to replace the old one, which accomplishes for Christians what the Passover ritual accomplished for the Jews.
Many believe that Jesus and the apostles did not actually celebrate on Passover but quite possible the "preparation day" for Pesach, which is the 24 hours before Passover begins. Part of that reasoning has it that during Passover the Sanhedrin could not meet, but if a decision was so important that it had to be made very soon, one member made that decision whereas it could be reviewed after Pesach was over. However, in the gospels, it has it that the Sanhedrin met and not just one member.
However, if I had to put money on what you say above, I'm going with you, whereas the "agape meal", which was held on Sunday, was merged with the Passover narrative to formulate the theology and some of the ritual behind the Eucharist.