found-my-way
I think you may have confused some facts with regard to Jehovah's Witnesses and the Watchtower Society. The two dates that the Watchtower has set for Christ return were 1874 and 1914. The other dates mentioned involved predictions of "the end" or Armageddon.
Also, Russell borrowed heavily from the Second Adventists....not the 7th Day Adventists. The SDA church was an offshoot of William Miller's movement even as the Second Adventists were. But they clearly went in different directions. As far as I know, there never has been any connection with the SDA church and the Watchtower.
Technically, "Jehovah's Witnesses" are connected with Rutherford, not Russell. Russell's followers were "Bible Students." Rutherford came up with the name of "Jehovah's Witnesses."
"Disfellowshipping" has nothing to do with "dismemberment." Otherwise, many of us would be missing limbs....