It's odd that Elder is still at the club. He probably doesn't have a future with us, so it would have made sense to send him out on loan, or allow him to leave on a free (even if we had to pay off the final year of his contract). It's doing him no good playing under 23s football at his age when he has no chance of playing his way into first team contention.
I'm sure I read that Wigan didn't want him on loan again this season, so presumably they don't think he's Championship standard.
Elder was second choice left back at Wigan in League One last season. The only reason he played as much as he did for them was due to Reece James having injury problems. I think you can guess who Reece's brother is...