Before Northrop dropped out, I would have thought they were the likely winner.
After that, once Boeing unveiled their prototype, I had a feeling they were likely to. The US Navy wanted the aircraft asap. Haivng bent metal makes a huge difference for that, even if the design changes.
"While the airframe is the most visible portion of the Stingray effort, it is only one-third of the overall program. Naval Air Systems Command is developing the carrier-based control station as well as the system to network the aircraft to the carrier and the rest of the air wing in-house, based on the work for the Navy’s Unmanned Carrier Launched Airborne Surveillance and Strike program."
The software is derived from the Boeing stack from the JUCAS days. The Navy took it and gave it to Northrop. Northrop then developed it further in the X-47B. Then the navy has taken what was developed there and handed it back to Boeing. Anything paid for by the gov is owned by the gov and this bit Boeing hard back in the day. They thought they owned it, as I understand, and were pretty peeved when the Navy passed it to Northrop. I have to wonder if that's part of why Northrop quit was because the software they refined is now going back to Boeing.