Let me try expressing this in another fashion.
If God abides only by Scripture, must he be inconsistant with Himself?
You wrote:
"Let me try expressing this in another fashion. If God abides only by Scripture, must he be inconsistant with Himself?"
God is not inconsistent. Men are. Sola scriptura is dependent upon interpretation which varies from person to person (leading to fragmentation). Also, God's word is not just the written word.