The thing that really gets me about the WT's "invisible coming" teaching is that there really are no scriptures at all that point to an invisible return. They base the whole teaching on Russell's understanding of the Greek word parousia as meaning "presence," rather than "coming," as it is commonly translated. But most scholars disagree. It means "presence" in the sense of the arrival of a royal personage with much pomp and ceremony. It might apply to a king whose 'presence' is being honored with a parade. It definitely does not imply a situation in which someone has sneaked into town unobserved.
The only other scripture that I have heard them use to support the teaching is John 14:19, "A little while longer and the world will behold me no more..." They teach that this means that the world would never again see Jesus, but that is not what the verse says. It must be understood in the light of all the other scriptures that describe a visible return. The JW's try to wash away all those other verses by applying a forced meaning to this one.