If it is true that JP wants the UAL grievance on PS dropped as a "pre-condition" to any joint meetings than JP is nuts.
He has no standing in a seperate MEC's grievance process.
However.......National will likely drag its feet on the matter, and that I can guarantee you. That grievance will never get settled favorably for the UAL pilots. It will go to level 2 and languish, awaiting a grievance review board and be on a slow boat to China waiting for National's equivilent of the OJ Simpson legal dream team to arbitrate. I'd say in 3 years you might see some movement.