My take: End result, no correctable error. All merited free throws were taken, by those who were entitled to take them. However, they were shot out of order, which 8.7.B tells us is just tough noogeys. Bad, bad officials. However, nothing at all was denied A1, nor to A. B was not improperly penalized in any way.
That would not be the case, however, if you allow players on the lane and play to continue after the free throws by A1. That would be denying A the ball for a throw-in, and would compound the mistake.
Move on. Don't screw it up next time.
If the coach had discovered it while A2 was at the line, I don't think you wipe them off and start over. No provision of 2-10 was violated, however 8-7 was ignored. But that is not a correctable error, and once all the free throws are completed and the throw-in granted, the end effect is exactly the same as if it had been administered correctly.
Just my $0.02
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