OOOoooookayyyyy ... now you're officially off the deep end. It is not a matter of "tradition" altering the "clear teaching of Christ."
Jesus' Institution of the Eucharist is clearly described in each of the Synoptic Gospels, and echoed by St. Paul in 1 Corinthians 11:23-26.
Jesus Christ himself drew the distinction between the old and new Covenants at that precise moment. The Passover is of the old covenant; the Eucharist is part of the new.
There seems to be no point in continuing, if you're going to try to finesse something as obvious as that.
Although I wouldn't call it the eucharist, I don't disagree with you. You're not understanding my point.