(assuming this is him)is a fantastic archer even tough he is unable to see.
Artorias:
http://25.media.tumblr.com/tumblr_m3u5w8oItA1r469qdo1_1280.jpg
If you watch the prepare to die trailer and see Artorias on the end you see that his left arm doesn't even move the slightest.
Gough:
http://images.vg247.com/current//2012/04/8577Gough01.jpg
IF this is indeed Gough. Look at his helmet. There is some kind of mud or rust all over it and you cant see anything trough that helmet.
This made me think that maybe all of the 4 knights had some kind of handicap? I can't see any handicap from Ornstein and I know nothing about Ciarin. Anyway, please let me know what you think.