I’m going to stick my two cents in here:
So why when a Kehilla gets together to make community standards and one rov decides the standards are too leninent and tells people not to eat from the Kehilla hasghcha, He is considered a Tzadik
Why don’t you ask him?
Well, I did. The purpose is to keep others informed. For example, take starkist tuna. At one point, the Vaad of the 5T would note on their Hashgacha if they were using this Kula. Yashan, Pas Yisroel, Cholov Yisroel (yes, the Vaad is not Machmir on Cholov Yisroel, as in Toddy’s), open on shabbos (as in Dunkin Doughnuts), etc. When the Vaad stopped noting these (rather critical) items in their Hashgacha, this Rov did some of his own investigation and found out what each establishment used. It evolved into the current list, in which there are certain minimum standards over what the Vaad holds of. The Rov will be the first to tell you the Vaad is Kosher, but he has a personal Achraus to his Kehila (which most do not use the list), and offers the opportunity to allow them to know what the issues are. He does not charge a penny to be on the list, and moves establishments on and off based on new information & his own checks. The Vaad can not act as quickly (for whatever reason). Rabbi Eisen, who is the head Moshgiach of the Vaad of the 5T, is very happy with this Rov’s list. Otherwise, when asked where you can eat, R’ Eisen would be unable to respond regarding each place’s Kulas. He now simply responds to look at the list.
Others (J&W22) have pointed out that the Rov will tell you what the issues are in a non list establishment (for example, the hot dog buns are not Pas Yisroel), and allow you to make the choice to eat there or not. He will never say it is not Kosher.
http://www.theyeshivaworld.com/coffeeroom/topic/is-the-vaad-the-mafia/page/2#post-329534