I recall a proper single seat variant of the FA-50 (F-50, IIRC) being mooted, but shelved. Not sure if that was because of the LM contract issue, but the fitting of an AESA radar was canned because LM objected. It was shown with a Vixen 500E radar beside it on the stand at an airshow several years ago, & I think the possibility of a Vixen with a larger array (Selex/Leonardo has offered a few variants) in the fighter model was suggested, but LM wouldn't allow it. But as you say, the upgrade of the F-16s raises the bar LM is trying to keep the F/FA/T-50 below.