When I initially read 4-23-3; I questioned it the same way that it appears you are viewing it. The re-written rule did NOT make sense, especially since the rule was written to "clarify" that a player must be
on the playing court to be legal.
It is my belief that the defender, once establishing LGP on the court, can leave the initial "two-feet-on-the-floor stance" and move with the offensive player; as long as the movement is inbounds. This explains why the defender no longer needs both feet on the floor.
I am sure the veterans will rectify my inaccuracies.
