Essentially he is a prince of the Church, there to consult. In earlier centuries it was designation of immense political power, above an archbishop, maybe even above a rook! Most significantly, so long as he is under 80, he votes in the next conclave. Inside joke - incardiation is not another level of ordination when he gets his zucchetto- it is strictly a manmade (papal) designation. Hence the Vatican humor that only the Pope and God can create ex nihilo. Though His Eminence (soon) O'Mllaey is well-deserving, this is also a signal from the Vatican as to his favor given te problems he faces, and it would have been an insult not to given his office. The Archbishop of Boston is almost most always incardinated It gives him credibility in dealing withoutsiders