So, every other group was different? Each group started the same way you have, and it ALWAYS lead to arbitration. Just cut to the chase and get on with it. That way, less rhetoric will come out, and you can blame arbitrators later if unhappy, not each other. It would be great if you could do it, but it is unlikely, sorry.
OYS
Pour it on.
They are all tuning out. That is those who don't have an active ignore list.
To working together guys! Cheers.