Well you'd be wrong, I'm afraid.
Here's a list of Creeds after Nicaea and citations from John's Gospel:
341 First Creed of Antioch.
341 Second Creed of Antioch – John 1:1, 1:18 and 6:38.
341 Third Creed of Antioch – John 15:26
341 Fourth Creed of Antioch
343 Creed of the Western Serdican Council – John 1:3, 10:30, 14:10, 17:21
343 Creed of the Eastern Serdican Council
345 Ekthesis Makrostichos or “The Long-lined Creed” – John 20:17
351 First Creed of Sirmium John 1:14, 14:16
357 Second Creed of Sirmium or “The Blasphemy of Sirmium” – John 10:29, 14:28, 20:17
Final paragraph:
And the whole faith is summed up, and secured in this, that a Trinity should ever be preserved, as we read in the Gospel, ‘Go and baptize all the nations in the name of the Father and of the Son and of the Holy Ghost’ (Matthew 28:19). And entire and perfect is the number of the Trinity; but the Paraclete, the Holy Ghost, sent forth through the Son, came according to the promise, that He might teach and sanctify the Apostles and all believers."
359 Fourth Creed of Sirmium or “The Dated Creed” – John 14:16, 17 & 26, 16:14
359 The Thracian-Nicaean Creed
359 Seleucia 9th Confession
360 The Homoian Creed – John 16:13
381 Constantinople – essentially an endorsement of Nicaea.
As you can see, John is regarded as authoritative and canonical throughout, really, including the Prologue, mentioned four times out of 19.