Why was homoousios used in the Nicene Creed?

The word homoousios is not in the Bible. It also was not a standard part of the Christian confession immediately before Nicaea. Rowan Williams described it as “the radical words of Nicaea” (RW, 236) and “conceptual innovation” (RW, 234-5). The Arians objected that these words are both “unscriptural” and “untraditional” (RW, 234-5). In contrast to these “radical words,” Williams refers to “the lost innocence of pre-Nicene trinitarian language” (RW, 234-5). [Rowan Williams - Arius, Heresy & Tradition, 2001] In the third century, the word homoousios was associated with Sabellian Monarchianism which taught that God is one person as well as one being. The word was used by some Libyan bishops to say that Christ and the Father are one and the same God, by Sabellius to abolish the distinction of the three hypostases, and by Paul of Samosata to describe Father and Son as a primitive undifferentiated unity. This was one of the reasons why the Arians did not like the word. But the anti-Arians did not like the word either: > 1. Eusebius of Caesarea unambiguously stated that it was Constantine, and nobody else, not even the anti-Arians, who wanted the word > homoousios. > > 2. After Nicaea, the word falls completely out of the controversy very shortly after the Council of Nicaea and is not heard of for over > twenty years (See - Homoousios ). > > 3. At the Council of the Western Bishops at Sardica in the year 343, where they rephrased the Nicene Creed, the pro-Nicene theologians > omitted the word. > > 4. At the end of his life Ossius gave his unconditional consent to the so-called "blasphemy" of Sirmium (AD 357), which states that neither > homoousios nor homoiousios are Biblical. > > 5. Eustathius, archbishop of Antioch in the 4th century, whose anti-Arian polemic made him unpopular among his fellow bishops in the > East, openly expressed his dissatisfaction with the formula approved > at Nicaea. So, if the word homoousios is not found in the Holy Scriptures or in the orthodox Christian confession before Nicaea, why was it included in the Nicene Creed?