Seriously though, I don't know a thing about Hedgehogs, but if the idea is hedgehogs get single minded and the fox has the ability to pick and choose, then sure the Watchtower can be considered that way. Sure the Watchtower Society believes they are right and always right and even if they are wrong, New Light will make them right. So based on New Light, the Old Light was right at that moment, but the New Light is righter than the less right Old Light.
My question for consideration is; If the Watchtower is like a hedgehog and single minded, what religious orginization is like a fox? Are they not all hedgehogs?