Great point, DD. To a logical mind your statement is unqualifiably accurate. However, we are not dealing with a logical mind...we are dealing with WT's mind. Here's how they get around this seemingly fatal snag:
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"In view of the foregoing, what can we conclude? When Jesus comes for judgment during the great tribulation, he will find that the faithful slave has been loyally dispensing timely spiritual food to the domestics. Jesus will then delight in making the second appointment – over all his belongings." (w13 7/15 p.25 par.18, bold mine)
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Essentially, WT has looked into the future and already determined not only that they have done a great job, but they've decided for Jesus that he will appoint them (and he will be 'delighted'....isn't that special?).
For an organization that denies they've ever claimed to be a prophet, the above statement is truly astonishing in its hubris and absurd assumptive progostications.
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being that their appointment is a "done deal" from WT's lofty perch point-of-view, JWs must listen and obey now as if they have all authority.