The fact that we needed to pick up another starter at the deadline, and shouldn't have had Elder starting a playoff game, does not preclude the other statement that the offense sucked in the playoffs from being true.
Regardless of who we had on the roster, if you had asked anyone on here 100% of us would have taken a scenario where we had Fried and Strider set to start four of five games in a short series against the Phillies, with the first two in Atlanta and Ranger Suarez starting two of those games against our top pitchers. Elder's game three start in that series should have come with a 2-0 lead if the best offense in baseball hadn't fallen victim to the junkballing mid-tier lefty, kryptonite to so many Braves teams of the past.
My personal wild assed theory is that Morton was probably healthy enough to start in Elder's place, and that AA gambled that the team could get past Philly without him in the hopes of making 100% sure Charlie was ready for the NLCS. There was really no need to put Morton on the DL at the end of the regular season, with the division locked up and home field advantage all but assured. That error ranks just behind not adding a starter at the deadline in front office mistakes that potentially brought the season to a premature end.