IRROPS could be tricky for sure. There will most likely not be enough J seats on a single plane to move you all to. It's likely your party would be broken up onto different flights. How they handle fare paying J passengers vs. non status award ticket passengers will also vary. Not something I'd really think about until it gets closer. Giving yourself the week buffer before wedding should alleviate most concerns about this. Just know in the back of your mind that some may wind up on a different flight downgraded to coach or premium economy. It all depends on the loads at the time of the flight disruption.