The Society's teaching was still in flux.
In 1922, the WTS dumped 1878 as the year for Christ's enthronement. In his famous talk "Advertise, Advertise, Advertise" (as recorded in the 01. November 1922 Watch Tower), Rutherford stated that "Since 1914 the King of Glory has taken his power and reigns." (p.337) However, "Brother" Sullivan stated: "[I]n 1914 he took unto himself his great power and now [at least by 1922] reigns." (p. 337) This did not (neccessarily) mean that he had been reigning since 1914, because Rutherford had explained earlier in his talk: "We believe, therefore, that the day of preparation ended in 1914; and that in 1918, or thereabouts, the Lord came to his temple." (p. 334) "The context shows that the throne here mentioned could not be the Millennial throne of Christ, but that it does refer to the throne of the Lord Jesus Christ, his position of authority as the representative of Jehovah after taking unto himself his great power to reign when he comes to the temple." (p.335) It appears there was a difference between taking the power (1914) and beginning to reign (1918).
Likewise, on page 326 the 01. November 1926 Watch Tower states: "In 1918 Jehovah God placed upon his throne his beloved and anointed King, in fulfillment of prophecy. (Psalm 2:6-8)"