I always got the "ransom" part
Interesting - I didn't.
IIRC the ransom was needed because a perfect man was needed to 'buy' back what another perfect man had lost. But...during the WT's sciencey public talks, they talk about how the sun will run out of hydrogen and that God can replenish the sun because of that scripture re the earth will be inhabitated for ever.
Hang on.
We know that suns die. We know that due to the huge distance that light need tos travel these events occured 1,000,000s of years in the past. So sun's dying must be part of God's perfect design, as these events happened before Adam and Eve sinned 6,000+ years ago.
So...if God can suspend his perfect laws for our sun, why couldn't he do the same for Adam or Eve? Or come up with a better plan to resolve the issue that this enormously painful one that involves suffering across human and animal life for 6,000 years and counting?
Our Sun's death can be stopped to fulfil his prophecy. Pity he couldn't have been more pragmatic with humans!