It has only been in the recent past that the NCAA rule diverged from the NHFS rule. It is not whether the player on the floor has LGP. What matters is did the player on the floor aquire his position legally (think screening and Principla of Verticality).
For example, during rebouding action, A1 gets a defensive rebound and B1 is standing directly behind him but is facing toward's Team A's basket. B1 does not have a LGP but he is entitled to his spot on the floor and if A1 turns around and knocks him down it is a PCF by A1 in both NFHS and NCAA rules.
Change my play just slightly: B1 has fallen to the floor behind A1 instead. He is still legally entitled to his spot on the floor (see Principle of Verticality) and if A1 trys to dribble over B1 or trips over B1, A1 has infringed upon B1's Cylinder of Verticality (I love this FIBA term because it describes how we should apply the Principle of Verticality.).
But the nimcompoops (I hope I spelled that correctly,
) in the NCAA who don't have a clue as to what a legal position on the floor issued an interpretation changing a logical ruling that had been with us for decades (if not centuries,
).
MTD, Sr.