I don't think Smalling is that smart, but he has a lot of potential to improve still. Working with Blind is probably helping him in that regard, as his mind is all Daley has. I don't think it works that way for Blind, who is very close to the best he will ever be in my opinion. I could be wrong, as Blind has a habit of proving people wrong.
When he first started for Ajax, the public opinion was that he would never be good enough for the first team due to his lack of athletic ability. He was very slow, not very strong, and he didn't jump that high either and turned slow. He was tried at centre-back, then as a left-back, and then benched and loaned out. During his loan he flourished, and Ajax was quick to start him the following season and played him at left-back. He did well enough, until injuries forced the coach to play him as a defensive midfielder. He was, to be frank, the best player in the league from that point on until Memphis' breakout season, driving forward passes from midfield, speeding up play, and working like a madman, winning best player in the league once or even twice, can't remember. And he still wasn't that fast.
I can see he has become a lot stronger at United physically, but he'll never be near someone like Smalling, it just isn't in him. It's funny that his father was exactly like him -- Johan Cruijff bought his father, a right-back at relegation battlers Sparta Rotterdam and he became essential in the spine of that legendary Ajax team coached by van Gaal with Kluivert, Davids, Seedorf, etc. His father was a centre-back, not fast, not strong, but very smart.
Daley Blind knows he wasn't born with all the talent in the world, and he knows his mind is the surest way to make up for some of that ground. His time at United will tell me how far hard work and honing a sharp mind can take someone.
I hope he suprises me again, he has done very well so far. If you had asked the public in Holland, we had never thought he'd do as well as he has at United. We doubted him again. Now I see the Redcafe arguing for a replacement centre-back, and it is completely sensible. But what if he does it again?