McDermott turns 26 next month, so he's who he is at this point. We don't know how he will look pitching on one or two days rest because the Orioles have not developed him as a reliever. Could he do it, perhaps, but that is part of my issue with the Orioles continuing to develop guys who could be of help as relievers as starters.
Could McDermott be that impact reliever this team needs? It's possible, but it might have been even more possible if he was used that way this year in AAA.
McDermott has a starter's repertoire, but he's got a reliever's command and he's been inconsistent as a starter even this year in AAA.
If they send him back down, they should do what they did with DL Hall and use him a reliever in August in AAA, see how he looks, then bring him up late in August for the pen so he's available in the playoffs if he looks good in that role.