I could be wrong but have rolled the bones, I think NG is going to be selected for F/A-XX because:
1. NG has been working an F/A-XX for quite a long time and was asked and probably had assisted the USN/NAVAIR with requirements.
2. I think NG only built a F/A-XX classified demonstrator (maybe two) and had no intentions of bidding the USAF requirement.
3. LM too pricey for both the USAF and USN, plus LM has F-22 (which will continue being upgraded), F-35 and "SR-72".
4. LM also may have been possibly trying to dictate requirements to both the USAF and USN (not good, you don't do that).
5. Boeing (as a corporation) has, F-47, KC-46, P-8, F-15EX, T-7, MQ-25, quite a current corporate portfolio.
6. NG may be levering some our YF/F-23 5.5 gen tech among other classified efforts involving NG fighter expertise.
7. Not a complete F-23 revival but NG benefited from YF-23 no matter how you slice it.
Comments and criticisms always welcome.