Yea, well, no doubt, but the purpose of a closing prayer at a session of the Republican National Convention, a political gathering at which the metropolitan is invited as a guest, is to ask for God's blessing upon the work of the convention delegates and nominees, in a secular environment at which most of those in attendance are American Protestants, with an additional mix of Roman Catholics, Jews, Mormons and probably an atheist and agnostic of two, not "to preach who Christ is." And it doesn't serve the purpose of promoting Christ's Holy Church, by taking advantage of a forum and offending the audience. Nor would it be likely he would be invited to a subsequent forum of this group, and perhaps a similar invitation might not be extended to another representative of the denomination which he represents. Metropolitan Methodios represented the Orthodox Church well, beginning his prayer with the Orthodox prayer to the Holy Spirit, "Heavenly King and Comforter...," and I'm sure gained some respect for our Holy Church which despite our time on this continent, is unknown, probably due to our most limited numbers, comparatively.
P.S. Within church curcles, I'm not particularly a fan of Metropolitan Methodios.