IMO Number 1...Secret sin.
I can just see the witlesses now. The big A is over, the birds of the heavens are stuffing themselves on the billions of carcases lying around, the dubs are gleefully cleaning up the mess with the zeal that they clean the kingdumb hall before the memorial with. Than someone says 'I thought for sure brother seemsfaithfull would have made it?' Than elder highandmighty says 'well obviously he must of had some secret sin that only Jehovah knew about.'