Joe,
Im searching for an explanation as to why watchtower has been so successful, as apposed to their Mormon counterparts
Are you?
You've been posting this stuff for several years now. That's plenty of time to become familiar enough with the two groups to avoid apple and orange comparisons, like equating the LDS General Conference to the JW Memorial, or for that matter, equating numerical growth with "success" which has been your basic premise from day one.
Like I've tried to point out, the free exercise of their faith, including their polygamous marriage customs was more important to the LDS Church than numerical growth. They separated themselves from society completely and their reintegration was slow, painful and even violent at times. (The Mountain Meadows Massacre happened shortly after C.T. Russell, was born, I believe.) The Mormons, as group, continued to be clannish and reclusive, especially in small towns, well into the 20th century.
You can't claim to be looking for an explanation for how the two groups got to where they are today while simultaneously glossing over all that history. --Not unless you're just here to stump for the JW's...