In my opinion Johnson is the biggest wild card as far as playing time goes. All three of our bigs will get a chance to produce at the 5. Grant, Fair, Roberson should all play at the forward spots. Ennis, Gbinije, Cooney will all play at the guards. Patterson, and Obokoh will probably be at the bottom of the depth chart. Johnson could end up anywhere.
To me Johnson's biggest competition is Gbinije for two guard minutes. We are pretty loaded at forward this year, and Johnson needs to put one some weight before he can handle some of the ACC biggest guys down low, so he is not going to play there when it matters.
However, it might not be the worst thing for Syracuse if Johnson beats out Gbinije for two guard minutes. That way Johnsons and Cooney can split minutes at the two and Gbinije can focus on being our back up point guard, which is going to be an important position for us this year.
It is most likely that Boeheim will only go with three guards when it is all said and done, and in that case Gbinije must be included because he is the closest thing to a point guard we have. But in this year's situation I could see Boeheim possibly extending his guard rotatoin to four if Johnson proves too good to leave on the bench (which i my opinion in very possible, I was impressed with him).