Thanks for starting this thread Ninja, I know you took a few hits because the info from the S.I. book was referring to the method of inpiration in relation to the Bible itself.
I'm sure you were aware of that fact before yopu posted the quote as you later qualified it by way of comparison to how they operate under a similar system.
As we all know they don't ever waste ink saying something which has no underlying message laced through it like a sweet poison.
In the quote you posted it's clear they would apply this same methodology to their own appointment and would meet their own unique beliefs/criteria.(My additions in yellow)
(1) Jehovah God originates his utterances; Their belief in their particular named God enunciated here......
(2) then his official Word, or Spokesman—now known as Jesus Christ—often transmits the message; (3) God’s holy spirit, the active force that is used as the medium of communication, carries it earthward; They of course are his official spokesman who "transmits" the message today.
(4) God’s prophet on earth receives the message; and They of course were "appointed" as have called themselves God's prophet on earth.
(5) he then publishes it for the benefit of God’s people. Just as on occasion today a courier may be sent to deliver an important message, so Jehovah at times chose to use spirit messengers, or angels, to carry some communications from the heavens to his servants on the earth.—Gal. 3:19; Heb. 2:2. The word "publishing" appears here..........wonder how that fits?..........also notice "god's people" is used....
So although this quote is reffering to the Bible the loaded language that's used will be instantly recognisable to the mind of an indoctrinated cult member who has read these same expressions many hundreds of times in the publications with refrence to the wts themselves.
After all the Bible is a poor second to a Jehovah's Witness both in authority and actual reading time. The "tools" that JWs are required to accept is where the actual doctrinal imperatives are even above the Bible.
Remember the thread is about them being prophets and if you place your authority above the Bible then you are greater than a prophet.
April 1st Watchtower 1986 page 30-31. "The Governing Body are the sole interpreters of the Bible" and "accepting this FACT is a requirement for approved association with JWs"
Massive statement.
H.K.