D.O.'s are "out of the way" generally. Congregation problems that cannot be dealt with by the elders go to CO or Bethel direct. I reckon they are reining in the D.O.'s by using Bethel heavies to follow the party line.
Not too long before resigning as an elder in about 2003 there was one time I was aware of a pedo problem that I was involved with as a "concerned elder" (but not directly in the loop) which resulted in the CO and DO meeting with me to hear my views.
My CO had hardly said a word and blew me off when tackled by me previously but I went to the DO and he granted me a meeting with him and my CO. When the DO was there the DO led and he was very open about inconsistencies in how the org. handles child molestation. The CO kept looking at him in a "Wow, are you really saying this to a mere elder?" sort of way.
It was all done in a hand-wringing way but it made me see that there are good intentioned but fearful men among the CO's and DO's.