Suso is developing, please remember how dominant Pacheco was though before we get too carried away. He played in a team with Romeo, Alacantara, Canales and Munian and was probably Spains best player but of that group he's the one that has not taken the next step.
At that age you can't just look at performances, you need to look at what the player will develop into. What attributes does Suso have that will enable him to make it at the highest level. Suso is small, he's not quick and doesn't score a heap of goals. He's immensely talented but it takes that for an undersized no.10. Sterling for me is a much more likely prospect. He's quick, good on the ball, works hard and scores regularly.