De La Hoya probably stops him. He's even bigger than Spence, faster, much better movement, more power, better defence, honestly Oscar was a level above Spence Jr. Spence would of been very lucky to pick up a title at 147 during De La Hoya's era with names like Vargas, Tito, Mosley, Quartey and Whitaker.
Spence wouldn't beat Oscar. What's crazy though is even though Shane beat Oscar at WW, I think Spence would beat Shane. And I think Shane would be hell for Crawford (the one who beat Oscar). Just the styles.