FWIW Adam Gorney from Rivals LOVES him some Sly Smith (who's ranked a 5.9 4-star there)
From 11/30/21:
"At safety, Caleb Downs is at the top of the list but we held off making him a five-star at this point. That could definitely happen in the future. I want to see more of this safety group in person. Caleb Downs, Derek Williams, Sylvester Smith (I especially think he could be special) and DaKaari Nelson lead the way right now. "
From 2/15/22:
"At safety, Caleb Downs is at the top of the list but we held off making him a five-star at this point. That could definitely happen in the future. I really like Munford, Ala., standout Sylvester Smith and he could move even higher after this offseason."
Also notable in that 2/15 post:
"Two others I really like in the four-star range who could move up are Mississippi athlete Isaac Smith, who starred at receiver/tight end at the National Combine but projects as a safety in college..."