It wasn't too much of a stretch to go from this:
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w52 2/1 p. 79 par. 10 Jehovah’s Theocratic Organization Today ***
God interprets and teaches, through Christ the Chief Servant, who in turn uses the discreet slave as the visible channel, the visible theocratic organization. David approached God through the priestly organization represented by Abiathar, who had the ephod; and a servant of today must likewise look to God’s visible organization for spiritual food that is timely and for directions in Kingdom service.
To this:
In a talk on the TMS this week about Abiathar, the brother said pointed out he was a high priest, equivalent to what a governing body member is today!