Don't forget "the Everton lad" was thrown in at the deep end by Evans being ill and Morsy suspended. He had to come in to an unfamiliar team with a partner who only played one game in that position, last week.
As James did last week he grew into the game but will take a bit of bedding in time, he wasn't meant to be playing a full game yet and would have been introduced gradually as a sub for a few games to get used to the pace etc. Plus Rotherham are a very physical team which he probably isn't used to.