Valencia has been pretty awful every time he's played, so it's more of a case of him showing more then enough to lose his place rather then someone taking it. He shouldn't have a place in the team.
Agree with rio, he needs a game, just would've rather given him it in the capital one cup, it's like moyes is prioritizing that over the fa cup which is weird.
On Fabio, what is the reason you're sick of hearing about him? Questions are rightly being asked because it makes no sense, he's obviously far better then both our back ups for right back and left back, yet can't get a game. He played constantly during pre season, and impressed, and scored in his last appearance in the first team, yet can't get a sniff. He played in a champions league final as well for us and was our main right back that season as well, and did pretty well for qpr last year. There's absolutely no chance he's regressed so much that he's a worse option then buttner or smalling at fullback, no chance at all. I'm not saying he's some potentially world class fullback, but he's definitely good enough to be good, solid cover for both sides, and questions will keep being asked until moyes gives a good reason.