Not being pedantic but I think Koeman classifies Barkley as a forward. I only say this as RK said yesterday re: McCarthy that he is one of 5 very good midfielders.
In relation to Barry, he's shown if rotated he's still a fantastic player. Not sure how many times he has to prove this?
For Davies, again, he will be rotated so not sure how he can't be relied upon in the most suitable games for his abilities.
We have Gana, McCarthy, Barry, Schneiderlin and Davies all challenging for the two holding midfield spots. Koeman has been waxing lyrical about them.
I just can't see how he gets anywhere near the team when everything he brings we have better elsewhere.