Shooter landing on defender laying on floor

[thedewed]

try using logic and extrapolate from these examples in the casebook:

B1 slips to the floor in the free-throw lane. A1 (with his back to B1,
who is prone) receives a pass, turns and, in his attempt to drive to the basket,
trips and falls over B1.
RULING: Foul on B1, who is not in a legal guarding position.

Me: why is it necessary to mention that B1 is not in LGP if it doesn't matter? Because it does matter.

A.R. 101. Player A1 attempts a shot, which bounces off the rim.
1. Player A2, who is in the lane area, grabs an offensive rebound and
immediately attempts a put back and crashes into the torso of B2, who is
grounded on the court within the restricted area; or
2. Player A2, who is located on the wing just inside the three-point line,
gains possession of a long rebound and immediately drives to the basket
with no defender. Player A2 crashes into the torso of B2, who is grounded
on the court within the restricted area.
RULING 1: When A2 rebounds the ball and immediately makes a
move to the basket, there is no secondary defender and the restricted
area rule is not in effect.
2: When B2 has established and maintained a legal guarding position
and illegal contact occurs, it is player-control/charging foul on A2.
(Rule 4-36.3, 4-31 and 10-1.14

Me: Why point out that B2 has established and maintained LGP if it doesn't matter? Because it does matter.

This is all in the same books that say this:

Every player shall be entitled to a spot on the playing court, provided
that such player gets there first without illegally contacting an opponent.