Stop in for a cup of coffee

I already mentioned possibly having a coworker there. He used to work for a big name builder here and knows the ins and outs. He could run them up one side and down the other, problem is he has a tendency to piss people off. So Im not sure that would be good. I thought about recording it also. I have every single text message to them and my wife does also for all of her communications with them.. No way will I be showing them the only contract I have let alone sign anything else.. They will be getting bad google reviews and BBB reviews when this is all done.
Have the coworker. Just tell no busting heads