The further, tragic irony is that this same group, a unity movement, experienced its own divisions. In addition to the doctrinal and social reasons for the eventual divisions, it should be observed that later divisions reflected an ideological tension laid out in Thomas Campbell’s original vision. Unity and restoration, as an enduring pair of principles in the subsequent Restoration Movement, came into tension with one another. This conflict between the two values hinged on the inevitability of differing interpretations of Scripture.
In other words, if even the people who were willing to follow only the Bible could agree on its interpretation and application, then unity would indeed be the inevitable result. Such uniformity of interpretation and application, however, was not to be. This problem was evident during the Reformation and was a source of Roman Catholic polemic against Protestants. Taking the responsibility for biblical interpretation out of the hands of church leaders or the pope and putting it into the hands of all Christians simply made little popes out of everyone. The outcome of endless divisions, so the Roman Church argued with some justification, was predictable.
Source: Keith D. Stanglin - "The Restoration Movement, the Habit of Schism, and a Proposal for Unity", by Dr. Keith D. Stanglin, in Christian Studies, Volume 28, August 2016, http://austingrad.edu/Christian%20Studies/CS%2028/Proposal%20for%20Unity.pdf