Wow...the double-speak is mind blowing....
"But we (the elders) are imperfect, and so cannot know everything about judicial matters. That is why we (the elders) have the biblical rule that there must be at least two witnesses to wrongdoing." We need to follow the two witness rule.
"Sometimes though it is impossible to have two witnesses to a sin, and we (the congregation) may feel that a sin needs to be addressed instead of left in Jehovah's hands." We DON'T have to follow the two witness rule. We DON'T have to "wait on Jehovah".
But we need to remember what we read here in (Jeremiah 29:23) . . .“‘“I am the One who knows, and I am a witness,” declares Jehovah.’” So he concluded that we must support the Two Witness Rule and know that, "eventually Jehovah will address any wrong in his perfect manner." We have to follow the two witness rule and wait on Jehovah.
So pretty much whatever the elders do/don't do...they're covered.