Just to really stir this up, what if we consider screening principles?
The offense may not cut off the path of a moving defender without giving time/distance.
I think it really boils down not to who jumped or who jumped first but the specifics of each case. Where was each player to start with? Which direction did they jump? Was the shooter's jump a "normal" offensive action.
I had another post that didn't seem to make it....retrying...
Quote:
Originally posted by BktBallRef
So, you're saying that once a guard establishes a LGP, he never gives it up? 
Why is there a difference in these two plays?
A1 is dribbling to the basket and B1, who has established LGP, now...
#1...runs in front of A1.
#2...jumps in front of A1.
10-6-3 Note specifically states:
If he/she jumps into position, both feet must return to the floor after the jump before he/she has obtained a guarding position.
If what you say is true, then a defender can never again be called for a blocking foul, if at anytime during the sequence he had LGP. And that's simply not true. Defenders establish LGP all the time and still illegally move into the path of a dribbler or shooter.
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The difference, I think is whether B's jump is "obtaining" a postition or "maintaining" a position. If B has remained in front of A the entire time (no head/shoulders by), then it is certainly possible that B's lateral jump is with the constraints of LGP. However, it is also possible that the jump was because A1 beat B1 and B1 need to re-obtain a LGP.
That, I believe, is the crux of this situation.
There also exists casebook plays wherein the defense draws a PC foul even though the defender was not in LGP.