Problem with Brunt is that he's far too old to be starting up the pitch, even though he is naturally better there.
He's only 31 but has aged poorly probably due to lots of games during his career.
Anyway, moving him further back was a smart short-term move, because he didn't have the stamina to go up and down the pitch like most wingers do. However, he isn't that great at left-back either, so I would mostly use him as a sub in the attacking wing position, or as cover for left-back next season, that is the ideal scenario as he is still useful, but should definitely be playing less these days.