Having been on our church council three times I think and congregational president once, I think the deliberations of council should be kept from the congregation. If minutes are posted, they can see the voting and from that should be able to figure out there was discussion, perhaps even dissension.
The job of a council member, in my view is to be honest, forthright and Biblical in the meetings. To simply serve as (another) rubber stamp for the pastor(s) or the council president is not in keeping with the duties and responsibilities of a council member. When the cussin' and discussion is over and the vote rendered, it then becomes the job of the council member to support that decision, that vote. We are all under authority and the council vote is the authority. If a council member cannot do that, then s/he must resign their position.
Some weeks ago in our prayers, there was one for the unity in council. I'm not sure where that came from, but I would argue that if there is unity in council (as I think it was meant) then something is seriously askew. There shouldn't be unity in council. Council unity implies a rubber stamp of somebody, and that's not in keeping with our responsibilities. There should be disunity in council, unity in/to the congregation.
Lastly, the "elders" or other people of influence should not keep information to themselves. When I was council president, our pastor gave notice. One of our "elders" knew also that the choir director was leaving and made the decision not to tell me. Never have figured out why. I have forgiven him, though I have as little to do with him as possible for that and for many other reasons.
Bottom Line: Council members need all the information from as many sources as possible. The congregation does not.