Whether the Invincible requirement made it into the final JORD was a bit of a moot point: the PWSC configuration was well under way by then, and the rival team was having a difficult time selling the reasons why its PWSC looked very different from the X-32. It's also possible that weight considerations precluded a longer airplane.
I believe that the wing span (A & B) is set by the non-folding wing and the requirement to line up X aircraft side-by-side on the LHA/LHD aft of the island.
Just for larfs, here's an early JSF concept with the UK folding wing. Reminds me of the A6M Zero.
