Looking at this from the bright side, with the IL stay being retroactive and the off days this week and next, Miley will only be out for sure until the weekend in Atlanta. The Brewers shouldn’t have much trouble covering the 9 games between now and then.
If this is nothing more than a little “discomfort” it might be prudent to give Miley some rest now with the hope that he will be ready for the next longer stretch with no off days and in better shape later in the season.
Realistically, we knew all along that with his age and history he wasn’t likely to make it through a whole season without some time off. I have a hard time even considering this (and his previous IL stint) to be bad luck.