The article is confusing but it sounds like the union wants both C and G at the table, but C and G both agree that C should be the employer and G doesn’t need to join the talks. So C is saying, if you really want G to join, you’ll have to wait until the appeals are finished.

I’m guessing the union doesn’t want to negotiate with C, have C go to G with the terms and G refuse and just causing endless delays in a game of telephone bargaining.