You make it sound as if
you pick the team...

Sands and Parks playing CM, and Ring on the left flank might happen because if Deila doesn't rate Mitrita and he sees that one of the three must be sacrificed on the left wing, Ring is the most potent of them to do a job there. From what I've seen, Ring hasn't been worse than usual (he's scored twice in the last three games), but his role has been different from what it was under Domè. Perhaps you expect him to do things that he's not asked to do by the gaffer - who knows.