Chuck "God" created the world and gave us all free will. So everything Chuck does should be considered in this context. Chuck also is not subject to space-time so he already has experienced what was going to happen here. We know this from His autobiography where he said it was Amara's time to shine. So just as he gave the Angels, Lucifer, and Humanity free will, he is finally giving free will to Amara. The plan is not to lock Amara up again, the plan is to offer Amara a choice between the cage and freedom, and then between destroying creation or letting it be. Amara had to sit on the bench all this time while Creation happened. Now Amara has to decide if there is some part of humanity that is worth saving. Hint: Dean.
There is one loose end. If Amara is darkness and Chuck is light and they perfectly balance each other, then how is it that Amara can't transcend space-time? I think of it as a white hole vs a black hole. Both have infinite/undefined power at the singularity, however a black hole destroys all information and a white hole creates all information and therefore all probabilities. (An example white hole we know of is the big bang.) If information cannot be created or destroyed (time can go backwards) then what we are experiencing is an illusion of time flowing. In that case Amara would have known all possible futures. However, if that was the case she would not need Donatello's information.
It had to be extremely difficult to write God into the Supernatural story-line and do it convincingly.
There is one loose end. If Amara is darkness and Chuck is light and they perfectly balance each other, then how is it that Amara can't transcend space-time? I think of it as a white hole vs a black hole. Both have infinite/undefined power at the singularity, however a black hole destroys all information and a white hole creates all information and therefore all probabilities. (An example white hole we know of is the big bang.) If information cannot be created or destroyed (time can go backwards) then what we are experiencing is an illusion of time flowing. In that case Amara would have known all possible futures. However, if that was the case she would not need Donatello's information.
It had to be extremely difficult to write God into the Supernatural story-line and do it convincingly.