Upvote:5
Well, it's theft of service. You are trying to collect 4 seats of early bird service, but you only paid for two. Southwest has every right and incentive to not support this in the most sincere way they can. All that to say, it's all on you to make sure this stays under the radar, and no quarrel develops that might attract staff attention. That means if another passenger objects, let the Wookiee win.
I would expect the consequence of staff attention to be that all four of you board last. Unless you double down on indiscretion, in which case all four of you board Delta.