Does this fit into any common sense ?
No, it does not make sense at all. If this was really a work that was backed by God, JWs would be proudly walking down the street preaching to all they could see, and without any fear, since Jellohoba and his angels would make sure to protect them.
But instead, you can be sure that for example in Saudi Arabia, or Pakistan, absolutely zero JWS do preaching work. Perhaps a hand full of locals get a hold of Watchtower litteratrash and pass it to others in secret, even that is doubtful.
So much for preaching in all the inhabited earth. Hundreds of new people are born everyday, and zero preaching in countries that put together make more than half of all humans.
So why not bring the big A already? Cause it's bullshit, thats why.