The phrase "true successor" refers to someone who follows and continues the work or position of another person in the most genuine and deserving way. Full definition
It looks like my simple touches true successor has finally arrived. (goodereader.com)
Charles the Great was the first emperor of this empire, which was in fact a pseudo-empire, because the real and true successor of the Roman Empire was the Eastern Roman Empire with its capital Constantinople and the Church of the empire. (religion.blogs.cnn.com)
God of War: Ascension is a very well put together game and one made for fans of the series who want to keep their Kratos fix in while we wait for the next true successor in the franchise. (darkstation.com)