It is not my reasoning along. You, of course, understand this puts Irenaeus squarely at odds with Augustine's, A Treatise on Predestination which you reject. Shall I start quoting that. We might as well pull this or that out of every writer. It won't matter because NONE of it is inspired writings.
Irenaeus statements are interesting but it really doesn't change anything. It only validates my point that in the western church two views were held. Irenaeus comments would not square with the Council of Oranges decrees.
CANON 2. If anyone asserts that Adam's sin affected him alone and not his descendants also, or at least if he declares that it is only the death of the body which is the punishment for sin, and not also that sin, which is the death of the soul, passed through one man to the whole human race, he does injustice to God and contradicts the Apostle, who says, "Therefore as sin came into the world through one man and death through sin, and so death spread to all men because all men sinned" (Rom. 5:12).
CANON 3. If anyone says that the grace of God can be conferred as a result of human prayer, but that it is not grace itself which makes us pray to God, he contradicts the prophet Isaiah, or the Apostle who says the same thing, "I have been found by those who did not seek me; I have shown myself to those who did not ask for me" (Rom 10:20, quoting Isa. 65:1).
CANON 4. If anyone maintains that God awaits our will to be cleansed from sin, but does not confess that even our will to be cleansed comes to us through the infusion and working of the Holy Spirit, he resists the Holy Spirit himself who says through Solomon, "The will is prepared by the Lord" (Prov. 8:35, LXX), and the salutary word of the Apostle, "For God is at work in you, both to will and to work for his good pleasure" (Phil. 2:13).
- (Some of) The Canon of Orange
If they did not square, then Irenaeus's view, as closer to the apostolic teaching, would have prevailed.
However, the contradiction between Irenaeus and Orange does not exist, as the quotation you chose shows. The contradiction is with Calvin's teaching on depravity of man and predestination of the reprobates.