It may move their appointment to all his belongings to the future, but we must not forget that they also changed what that means. It used to be that "all his belongings" included:
These “belongings” include the growing “great crowd” of “other sheep.” - w09 2/15 p. 24 par. 3
Moreover, Jesus Christ has appointed the faithful and discreet slave “over all his belongings”—all Kingdom interests on earth. (Matt. 24:47) Included among these belongings are the facilities at the world headquarters of Jehovah’s Witnesses, at branch offices in various lands, and at Assembly Halls and Kingdom Halls worldwide. Included too is the work of Kingdom-preaching and disciple-making. - w09 2/15 p. 26 par. 9
These things have been moved to the status of "domestics" and their current responsibility:
13 Who, then, are the domestics? Put simply, they are those who are fed. Early in the last days, the domestics were all anointed ones. Later, the domestics came to include the great crowd of other sheep. The other sheep now make up the vast majority of the “one flock” under Christ’s leadership. (John 10:16) Both groups benefit from the same timely spiritual food that is dispensed by the faithful slave. What about the Governing Body members who today make up the faithful and discreet slave? Those brothers also need to be fed spiritually. Hence, they humbly recognize that as individuals they are domestics just like all the rest of Jesus’ genuine followers.
14 Jesus placed a weighty responsibility on the faithful and discreet slave. In Bible times, a trusted slave, or steward, was a house manager. (Luke 12:42) The faithful and discreet slave is thus charged with the responsibility to manage the household of faith. That responsibility includes overseeing material assets, the preaching activity, assembly and convention programs, and the production of Bible literature for use in the field ministry and in personal and congregation study. The domestics depend on all the spiritual provisions dispensed by the composite slave.
- w13 7/15 p. 23 pars. 13,14
Thus, while admitting (and properly so) that Christ has not yet appointed them over all his belongings, they take what used to be considered all his belongings and placed them under their current charge.
Back to the OP, though, a passage that comes to mind is 2 Cor 11:12-15:
But what I am doing I will continue to do, in order to eliminate the pretext of those who are wanting a basis for being found equal to us in the things about which they boast. 13 For such men are false apostles, deceitful workers, disguising themselves as apostles of Christ. 14 And no wonder, for Satan himself keeps disguising himself as an angel of light. 15 It is therefore nothing extraordinary if his ministers also keep disguising themselves as ministers of righteousness. But their end will be according to their works.
This may very well indicate that the disguise changes over time.