I havn't said otherwise
I've yet to see Simpson totally embarassed in the way I have Taylor, he's had poor games (especialy earlier on in the season) but there's never been any SWP/Sturridge moments where i'm thinking "Simpson, where the fuck are you?" about 7-8 times in 45 minutes. Ryan Taylor also has Jonas covering his arse (who had the gall to come inside once against Man City, leading to Richards having about 30 yards of space to the left of our box).
Your last sentance is an opinion I disagree with. I've seen Santon play a handful of times and always on the left and he's shown nothing to suggest he is a better defender than Simpson.