I've seen Watkins make some jump cuts and back-jukes but I don't see Watkins making the types of jukes and cuts that extraordinarily quick players make. I'm not saying the guy can't be elusive but it's not something he's special at.
Take for example, these plays:
First play in the video...look at the effort he has to put into gearing down. Compare it to another guy with extraordinarily loose hips:
Here's a catch against SC:
Watkins makes a nice back-juke at the end but look at his first cut after the catch. Watch his feet and hips, it takes him way too many choppy steps to gear down before making that cut.
Compare it to this:
Look at how easy it is for Austin to cut at both full speed and after he makes a catch.
Even here where he makes an amazing play:
Look at how awkward the juke looks because it takes him 3 steps to do it
Compare that to:
Look at how sudden and quick that juke is.
Watkins is just a more tightly wound guy. He doesn't have the same sort of hips and quickness that those guys do.