Vision is a great skill for alot of positions. WR is not one of those positions. Vision does not directly corrolate to catching, I can assure you.
128 catches. 14 drops. Low vision.
http://goallineblitz.com/game/player.pl?player_id=46636As you get faster you need more catching to track the ball. A level 2 with 20 catching catches better than a level 20 with 40 catching because the low level player is moving slower, hence can catch the ball easier.
Also as your catching goes up, the bubble of passes you attempt to catch raises, resulting in more drops as well as more completions.
You will never have zero drops as a WR, whether you have 15 vision or 70 vision. Well actually perhaps the 70 vision WR would have zero drops cause he never gets thrown at because he's not open...