Neither of them can guard Achiuwa. Polley is a very similar player to Delaire. Achiuwa embarrassed delaire on the circuit, it got so bad they had to take delaire off him mid game. Akoks got great length but his foot speed is too slow he’ll be better against traditional bigs.
You're correct that we don't have someone who can guard a strong, athletic 4 well. That's why we were killed by Cook the Iowa kid last year.
That being said, you're delusional if you think Sid could do better than Akok or Polley. Precious CANNOT shoot at all. He is downright terrible. Any coach with half a brain cell is going to counter him with length and play way, way off the shot. Force him to pass to his left hand and shoot. Foot speed is less important because he's an incomplete player. In the half court, every coach in America knows he's going to try to jump stop on the right block and finish.
Sid is literally 3 inches shorter and 40lbs lighter than precious. You think he's going to be able to defend him on the drive. He may have the foot speed but he's going to get bullied and eaten alive.
IF the game becomes too fast and Precious is getting out in transition, you may need to counter with Sid as his check.
Whether Delaire and Polley might be similar is irrelevant. I saw the tweet about that game too. This isn't AAU it's a high-major organized defense. Did you watch that game? The defense was terrible by everyone. Because that's how NE6 works. It's about showcasing talent, not winning games.