I've Fallen And I Can't Get Up ...

[Freddy]

This has always been the pertinent reference for me regarding this issue and similar ones:
4-23-1: Guarding is the act of legally placing the body in the path of an
offensive opponent. …Every player is entitled to a spot on the playing court provided such player gets there first without illegally contacting an opponent.
A. The player on the floor got there first, albeit not intentionally, without illegally contacting an opponent, right?
B. My objection pertains the applicability of the first part of that rule. Can the activity or status of that player be considered "guarding"? Did he really place his body in the path of the offensive opponent? Is that was he did? I don't think so. Do you?
I'm not saying I know the definitive answer, and am looking forward to the rules-based responses of others. But I'm pretty confident that LGP isn't a prevailing consideration whatever adjudication one finally accepts. He wasn't "guarding."
I reserve the right to be wrong on this.