TOH
The HS is therefore seen as operating or appointing in the sense that it is the force behind the spelling out of the requirements, the force behind the changes in living which the candidate has carried out, and the force working or influencing the elders during prayer.
You are presenting the WTS take on this correctly. However, it always seemed to me the explaination never really made sense because of the highlighted portion. Either the HS is "speaking" to the elders in the sense that it is moving them to appoint or not appoint or its not. Sure, saying that if the person meets the qualifications in Tim & Titus (plus the extra qualifications from the WTS including 10 hrs in service, commenting at meetings, etc) is in a way being appointed by HS is fine with me. It's the whole, "let's pray over it to get Jehovah's direction" that seems to me that at least implies to the rank & file that HS had the final say.
There's also the whole "the branch also prays over the appointments" issue which adds even more validity that the WTS claims divine appointment for even elders & MS. Clearly, its to reinforce their local authority (disagreeing with the elders can be seen as disagreeing with Jehovah). But, they back off that claim when it's evident that they've made a mistake.
BTW, many clergy and layclergy in other Christian denominations will often say they were "called" into their ministry, meaning the HS moved them to service. So, I'm not arguing that the WTS is alone in claiming divine direction in selecting religious leaders.
The best argument the WTS can come up with on this issue is to point out that Judas was selected by Jesus to be an apostle and look how that turned out. Of course, it is said that Judas started out good and that Jesus didn't make a mistake. But, I've known several situations where men were appointed elders and at the same time doing things that would get them df'ed (such as having sex with a pioneer while someone was on a "long" RV to someone not his wife, he was a MS at the time and was soon appointed as an elder).