I'm not trying to be argumentative.. honest... but we 'old timers' can remember when it wasn't unusual for a pitcher to throw a complete game. Then we started having a designated "Closer". Now we're having someone designated to pitch the 8th, and even down into the 7th. Can the 6th be far behind, especially if a team has built a bullpen with that kind of depth.
Picture our starters going 5 innings, then a closing staff of Kelly for the 6th, Smith for the 7th, Thornburg for the 8th, and Kimbrel for the 9th. That would leave guys like Ross, Hembree, Abad, and Workman to fill in as needed for a partial inning or for long relief, with long relief defined as 'up until the 6th inning', or if a game got out of hand early.
Is that was DD was trying to accomplish?