It seems that there was sort of a power struggle within the organization to share the authority that used to be exclusively that of the president. Russell and Rutherford had absolute control during their tenure. But things began to change in Knorr's administration. When the elder arrangment was introduced to the congregations, it was apparent that something was lacking in this "scriptural arrangement" at the headquarters. This was the chance for others to share the responsibility and power that came with leadership. Of course, as with all changes, the Society felt a need to justify it by giving the scriptural reasons. Some resisted this change including Knorr and Franz. But it was too late.
It's an old story. The Catholic church has struggled with the same issues down through its history. Does the Pope have sumpreme authority or is he subjected to that of the authority of the Cardinals? It is one that divided the church during the debates about the doctrine of the infallibility of the Pope in the 1870s. Many left the church and formed the "Old Catholics."
The very human organization of Jehovah's Witnesses is not immuned to the very human emotions and struggles that have beset other groups.