I don’t think he was being played enough in the Prem but there are signs recently that is changing. IMO he is now far more important to this side than Sterling or Mahrez. Technically, he is a much better footballer than Sterling and he has more end product than Mahrez. Like any top side, it is important that you get your best players on the field more often than not and Foden falls into that category, even as the kid he is. In recent weeks Foden has shown both Sterling and Mahrez that when you play wide forward in this side, you have to deliver consistently, that means goals, assists and good performances overall. Sterling and Mahrez very rarely provide the whole package.
For me, if the rotation in the front 3 is going to continue, more often than not it should be rotation between Sterling and Mahrez on the right, with Foden one of the 1st names on the team-sheet until he is in need of a rest.