It looks like a normal "days off for everyone on Sunday" line-up in a normal season. With a doubleheader and three games in 24 hours all these guys were gonna have to get a start anyway. But it also looks like a white flag. You never know, though.
It's too bad they couldn't have gotten Kingery and Quinn back in the line-up. I suspect they also don't want to make a 40-man move before Wednesday (when anyone they waive won't be eligible to join a new team for the playoffs. They kind of did Walker a favor cutting him loose but probably don't want to lose Torreyes or Garlick (even if the latter is more to have him around potentially next season).
You just don't want to lose both today. 3-4 or 4-3 was always the goal. That was before Wheeler and Howard both got hurt (not that Howard's injury affected the game yesterday) but 2-5 would still not be pretty, and things could fall apart against Toronto (or we could even lose our first games to Washington) if the rotation can't catch a break.