[BroJoeK]

Bull Snipe: "Lee mentions nothing about ordering Stuart to use his cavalry to attack the Union rear during Pickett’s Charge."

Thanks for that.
Until recent years I didn't know that Stuart had a role on day 3, it was never emphasized.
Then a few years back I started hearing that, oh, that Stuart, he was key to a Pickett's charge victory, by attacking the Union rear would join up & rout them.
Also, iirc, Ewell was going to finally take Culp's hill, making victory inevitable.

Your explanation here tells us why traditional Gettysburg histories said so little about Stuart's end run.

[Bull Snipe]

On both the 2nd and 3rd days of the battle. Lee’s orders to General Ewell were discretionary as to taking Culp’s Hill. They essentially said if he saw an opportunity to take the hill he could do so. Lee never issued a direct order for Ewell to take Culp’s Hill.