The most recent reincarnation of the OM book is the OD book - Organized to Do Jehovah's Will (2005). See p. 16ff. Here they really hammer home the identification of the 'slave' and the 'belongings' far more than in the previous book.
A couple of highlights:
WHY TRUST "THE FAITHFUL AND DISCREET SLAVE"
There are many reasons to have complete trust in the slave class. First and foremost, Jesus has appointed them over all his precious "belongings." This is a clear indication that he has complete trust in them. - p. 18 [italics in the original]
Another way to show that we trust the slave class today is to support its decisions. Even though we may not fully understand the reasoning behind certain decisions, we know that upholding them will be for our lasting good. On occasion important issues have been clarified, and we have wholeheartedly supported these decisions. As a result, Jehovah blesses us for our obedience to his Word and to the slave class. We thus show our subjection to the Master, Jesus Christ. - p. 20
The foremost reason given for completely trusting the 'slave' was that Jesus put them over all his 'belongings.' This is now known not to be true and naturally can not be put forward as a reason for trusting the 'slave.' Seeing as this reason for trusting never really was a reason for trusting, how can they be trusted to truly clarify important issues (like why we should completely trust the 'slave') and expect our wholehearted support and obedience?