Sleven, that is very plausible, especially because Hikma may be the primary target of the lawsuit. By getting HealthNet out of the way, Amarin was able to appeal as of right with all issues being final as to all parties.
Could they pull in another insurance company? Yes. Will they? Likely not, as I think with the delay and the tone of the oral argument, they want to zero in on their arch-enemy, Hikma.