Are you freaking serious?The keeper who will be dissappointed by the goal he conceeded?
Smalling doesnt need to be a world class CB. He just needs one next to him. He can be an almost world class out and out defender as long as the guy next to him is a good defender and can play the ball as well
He conceeded? The whole team conceeded. It wasn't Arsenal vs De Gea (though it looked like it on multiple occassions), and if so you should really put some blame on the 3 centre-backs & 2 wing-backs supposed to defend him.
It was a good shot by Giroud which De Gea almost had.
And thats really besides the point. De Gea saved what, 5-6 goals (exaggeration maybe) today and you chose to rate smalling over him today based on the fact that one of shitloads of chances went in?
Evans have proven that he can be a "good enough defender" if put next to a world class one before, just for your information.
Jones also have put in great shifts. There really isn't much separating them except for their different strengths and weaknesses.