Someone help me out here. How can the two views of the catholic church, east and west, in communion with rome have such different sacramental views on confecting a marriage? For example in the west it is said that the sacrament is confected the bride and groom and they are the ministers of the sacrament, the priest being only a witness, which is why deacons can preside. In the east however the priest confects the sacrament an is the minister, the bride and groom only recieve the sacrament, thus a deacon (i believe) can not marry eastern catholics.
These seem like radically different sacramental theologies. Yet both claim to be catholic. Does the baptismal diocese of the person really determine their ability to confect the sacament for a layman, or the ordination into a rite, say latin, reduce it so his priesthood does not allow him the ability to confect the marriage. What is going on here? Why the disparity?