All Scripture, not just those red letters, is the very Word of God. Christians dont get to pick and choose which ones we like or decide which parts have priority.
As I explained, I take exception to the notion that certain portions of Scripture are more important than others. You said Jesus words have priority. My point is that all of it is God breathed. All of it came from Him, not just those red letters in the New Testament.
It could have been interpreted to mean the Gospels 'only'.