I see no reason for a "JCBA".
You will never get a "JCBA", either under ALPA or anyone else.
Under ALPA, each group must separately ratify a "merged" contract. Guess the odds of that, one with and one without the Nicholau.
Under USAPA, the west dudes have a better chance of cashing their lottery ticket, but, the west is stagnant and the east is not. I cannot imagine an east FO willing to vote for a merged contract that includes the Nicholau knowing that they will go from right seat 767 international to right seat PHX-Yuma. Can you?
Not to mention, the east ALPA gave 25% of east flying to the west, which equates to a 50% increase in the west flying, allowing some 600 west pilots to not being furloughed. Why would anyone from the east give anything further to the west? An entity that the east saved from chapter 7? I say, let them die the death they deserve.
Go to work for evil, then succumb to evil. A phrase uttered by a former General Consul of USAir when I asked about going to work with America West. He is still on many boards in the SW and knows the executive thieves freaks in tempe very well.