Didn't read everyone, but I've got a couple that have flown under the radar for a long time.
2007 Parcell's rushes "She" Glenn back from knee injury in training camp,
Glenn reinjures, and is done. But Jerry doesn't replace him, Glenn returns for the last game of the season for 0 receptions on 1 target, then the division championship against SF for 2 receptions on 5 targets for 15 yards. Glenn never plays another NFL regular season snap. Done.
Glenn was less than 150 yards behind TO in 2006.
2016 Not giving Tony a chance to come back
As long as Tony could stay upright, he was still the better QB. He had MVP level play in 2014.
If Tony breaks again, put Dak back in, and we're back where we were anyway.
If Tony *doesn't* break, then we have a better chance in the playoffs with Romo having the most dominant oline and RB combo of his career.
And we have two pro bowl level QBs under contract for the offseason, with Dak's being the most valuable contract in the league, paying nothing for a rookie pro bowl QB. We could have traded Dak for a mountain of treasure. What could we have traded Romo for if he had come back and proved himself healthy? Instead, we got *nothing*.