Intrepid:
"Company lawyers will cut this one to pieces in one hearing. I guarantee you there is more then enough legalize in countless documents that torpedo this grievance."
I guess I don't get your statement at all. Who cares anything about the quality of the Company Lawyers or even the chance of winning the grievance? This is about loading your gun with the ammo you have left and making a point. It's statements like yours and the associated attitudes why the CAL Management has done basically anything they want over the years.
If the contract/TPA says no 787 in IAH then stick to it, simple.