This doesn't need explaining. As good as Singletary may be, Barkley is levels better. Barkley is a threat to score any time he touches the ball. That 40 yard scamper by Moss in Miami is a Saquon TD. This new found screen game would be lethal with Saquon. He's also an incredible decoy and mismatch that you have to account for which opens up the pass game.
RPO with Allen and Barkley...tell me you can't see it.
That's not to say "get rid of Motor", just upgrade a position that can be upgraded and put this team over the top.
All that to say, the Giants aren't trading Barkley. They would be fools to. This move, if at all a possibility, should have been made in the off-season like a few of us were suggesting.