If you tar the Orthodox with the ancient heresies we fought and overcame or expelled, with equal justice, Rome may be charged not only with briefly harboring monthelitism, with its principal and enduring heresy of filioquist triadology "the semi-Sabellian monster", the ecclesiological heresy of setting a single see as superior to the Holy Ecumenical Councils, the heresy of created grace and all its off-shoots (purgatory, indulgences,...), but with spawning Pelagianism, Catharism, Hussitism, Lutheranism, Calvinism, Zwinglianism, Moravianism, Anglicanism, and on and on. I don't think you want to go that route--it is much worse for your cause than ours.