The problem with this thinking is ... it limited the power of God. The Watchtower under the leadership of Rutherford have long held that Jehovah's knowledge is limited, or rather he chooses it to be limited.
In other words, that God has an eternal purpose, as oppose to the biblical view that God has a Divine Plan.
A purpose requires nothing other then a beginning and an outcome. The JW's are taught that God did not know Adam would sin and bring condemnation into the world, so he had to think of a quick solution to rectify it, he thought up "plan a", but Satanm soon threw a wrench into it, so he had to think of "plan b" and so on.
Thus our existence is merely a "cat and mouse" game between the two great entities, a mere chess game between Jehovah and Satan.
In the biblical view of God having a Divine Plan, God in all his wisdom, KNEW, that in creating life as free moral agents, the possibility was that they could decide to sin, so he made a way out for them, through his Son.
So unlike the Watchtowres purpose, where God really has no control, just trying to keep up to Satan, the scriptures teach us that God is in complete control, and everything is going acording to his plans.
_______________
Less Religion and more Jesus!