Liberated,
Russell did not write the Finished Mystery. It was written by Clayton J. Woodworth and George H. Fisher in 1917, Russell died 1916.
Today, those that still look to Russell's writings, 'Bible Students', and there are different denominations of the BS, flatly reject the seventh volume of Studies in the Scriptures. Therefore it was not Russell himself that taught what is written in the SS 7th volume.