There are 2 big wild cards.
Zach Randolph: Last year, if going into a game he wasn't recognized as the best player on the floor, he would play as if he was making a case that he was. Right now on some nights, he's the 3rd best post on the Grizzlies, at best (props to Mo Speights and Dante Cunningham for coming along nicely).
Gilbert Arenas: He sees the court so well, that when Conley is out, and Arenas is in there, especially with OJ Mayo, the 2nd unit could be as good as there is in the league. He is a better defender than I expected. If Agent 10 starts nailing 3s like when he was Agent Zero, it will make be tough to beat the Grizzlies. It also keeps Conley fresh at 30 minutes, instead of at 38 minutes/game.
Still, it is tough to ignore the fact that they need to still beat some top teams.
One win against OKC isn't enough.