The Metropolia's relationship with ROCOR was rather tenuous throughout their nearly 25 year association. Although formally a part of ROCOR, the Metropolia did not function in compliance with ROCOR's statutes, primarily because of the authority the Metropolia allowed to the priests and laity through the All American Councils and the Metropolitan Council. Even when ROCOR adopted its statutes, the Metropolia sent a letter taking issue with them. There's much more involved, too much to elaborate upon here; however, the Metropolia (the Russian Orthodox Greek Catholic Metropolia of North America) considered itself a metropolitan district of the Church of Russia, which could not administratively be directly under the Church of Russia due to the Communist's authority over the Russian Church. Its relationship with ROCOR was essentially a fraternal association with fellow "Russians" of the Russian diaspora, it was not perceived as a canonical dependence. The relationship varied over the years, but after WWII, the traditional Metropolia members, priests, bishops, and laity, within North America, desired to petition Moscow to reestablish their relationship with the Church of Russia; the true ROCOR followers, immigrants mostly, did not agree. However, the Moscow Patriarchate required that the Metropolia agree to not criticise the Soviet government and would not give them full authority to elected their own primate. So, the Metropolia decided to maintain the status quo of self-declared "Temporary Autonomy." 1946 or so marks the period when the Metropolia remained estranged from the Church of Russia and not affiliated with ROCOR.
ACROD's history was that they were of the Byzantine Rite under the Roman Catholic Church, but in America, the Roman Catholic bishops were not tolerant of them and their Byzantine ways, as they had been in the Czechoslovakia and the Carpatho-Russian regions of Eastern Europe. ACROD wanted no part of the Russification that had been imposed by the Metropolia upon the Byzantine Rite parishes that had flocked to the Metropolia in the early part of the 20th century. So they approached Archbishop Athenagoras of America of the Greek Orthodox Archdiocese, who referred them to the Ecumenical Patriarchate with his recommendation.
The GOAA had maintained communal relations with the Metropolia throughout their schism with Moscow. When Fr. Alexander Schmemann approached Patriarch Athenagoras at the Phanar about a canonical relationship ('67+/-), +Athenagoras could not accommodate his request and maintain Constantinople's good relations with its sister church, the Patriarchate of Moscow, a church with which +Athenagoras had made great strides during the 1950's and early '60's to accommodate the Russian Patriarch's various grievances. (As patriarch, +Athenagoras devoted much effort to improve pan-Orthodox relations in order to convene conferences among the Holy Orthodox Churches.)
It should be noted too, throughout the 20th century, until the formal dissolution of the Russian Patriarchal Exarchate, relations among the three Russian jurisdictions in North America (except for the Metropolia-ROCOR relationship, such that it was), was hostile.