He’s thinking of Longstreet. Lee turned down his suggestions for flanking the Yankees, which is not to say that they might have worked any better.
“He’s thinking of Longstreet”
I suspect that he may be thinking of Hood, who commanded a division under Longstreet.
Hood repeatedly asked Longstreet to let him swing around Big Round Top and strike the Union left flank from the rear but Longstreet refused him, citing Lee’s orders.