Cintron is far from a step too far. He's always been mediocre, nothing more.
Alvarez has some talent but he gets hit too much. Cintron will come forward enough, and is slow enough, to make this a relatively easy fight for Alvarez.
When Alvarez fights a real boxer - like a true counterpuncher or skilled boxer who uses movement, he'll be made to look like a fool.
But that's not Cintron, who is more or less a low-end gatekeeper at this point.