And it is first because it wasn’t written by the whim or feeling of the writers. They only wrote down what the Holy Spirit instructed them to write.
And since it wasn’t their own thoughts or feelings, and since God was the ultimate author, God’s word is to be the ultimate authority on anything and everything.
The phrase “moved the prophets”, means “carried along like a ship directed by the wind”.
A ship will be blown by the wind, but each ship may travel a bit differently depending on size, sails, rudders, etc. They will all be blown and will probably end up the same place, but how they get there may be different.
And it also was NOT dictation, it was God using the Holy Spirit and the prophet’s personality to say what he wanted them to say.