I am well aware of Isaiah you quote.

GOD CAN HAVE IT ANY WAY HE LIKES,.. RIGHT?

So it didnt have to be that narrative, unless God
wanted it that way ie: it was not compulsory.

He could easily have totally canned lucifer
Thus sparing his son and Adam and Eve
and mankind from such interelated fates.

-Bulletproof and Waterproof don't mean Idiotproof.