From the article itself:
"Typical caveats apply, of course: This is imperfect data based on the game charting project, which means it comes off limited television camera angles. In past years, this data has been very inconsistent from year to year, and we're going to study that in the offseason to try to figure out if we can get more accurate numbers by, say, looking at players over two-year spans. (I wrote this last year as well, but this offseason we have, shall we say, "extra free time.")"
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Do those stats include all the times he jumped a route without any help over the top and then his guy runs for 20 yards? TV angles are not a good way to grade out DB's for every play, it is too limited.
The guy is a huge liability. And the Eagles thought he was so great that they went out and traded for a young CB with a huge upside unless he goes the way of Asante, and paid huge money to Nmadi. Is their perception reality?