re: What is the advantage of our corners playing the man instead of the ball?

Ideally, the CB should be in perfect position, read the WR to determine that the ball is inbound, turn and make a play on the ball.

If the CB isn't in perfect position (trailing the WR for example) he's supposed to keep his eyes on the WR and attempt to take the ball out of the WRs hands as the WR attempts to make the catch. Cyrus did this yesterday to break up a TD.

Some DBs are better at playing the ball than others. Sylve doesn't appear to have a knack for it but could've been jitters. I rewatched the game today and he was even worse than I initially thought. I'd love to see him bounce back and play well but wouldn't be surprised if he's replaced.