I've said this before and I'll say it again. The more you do something, the better you get at it. Marcus Smart has no plays run for him in the offense. All the plays go through Isaiah, Turner or Bass, and sometimes Zeller. So how then you learn the speed of penetrating to the basket with very little opportunities? Not to mention, the refs aren't calling all the bumping he gets going to the basket as they do the other guys. Smart gets mauled going to the basket, but if you breathe on Wade, they darn near call a tech.
I had a pretty decent first step, but for the most part, I got to the basket at will because of spin moves, and sudden movements.
You don't have to be super quick to beat your man off the dribble. Cousins is not terribly quick or fast, and gets to the basket.
I know we want Smart to be Michael Jordan year one, it's not going to happen. If you want to jump off the band wagon, go right ahead, but I just watched him play, and although he fouled out, he absolutely changed that game with his pesky play. He's going to be a stud in this league, no comparisons, he's going to have a style all his own.