1. His nonstop effort. Running routes, every play, is tiring. Most receivers run them half-ass if they know they aren't getting the ball. Look at him, especially against Revis. He runs every route like he's the No. 1 target. I saw him give Revis a (successful) quadruple move at the line once. What he lacks in speed, he more than has in effort and cardio endurance.
2. His ability to get open. I'll defer to Fitz on that one. He's been quoted many times as saying the guy just finds ways to get open.
As for the big moment, though, despite having a top-10 catch-per-pass ratio... ...he's 0-2.