Evidence that he has taken power and begun ruling in heaven is abundant (bh 84-95)
We urge you to grow in your understanding of these facts
I find this comical... the explanation has always seemed like a stretch to me, even when I was a kid.
Jesus becomes king, war breaks out in heaven and, as a result, he sends Satan and the demons down to the earth. All of this supposedly happened in 1914, and that is why there have been so many more problems on Earth ever since. (Again, supposedly)
What has he been doing ever since? Working with a flawed, corrupt, earthly organization? Riiiiiiiight!