Glenn Davis.
I'm not sure how much damage the Chris Davis contract has actually done to the franchise.
Assuming that Roch was right when he said the Davis money wouldn't have been spent elsewhere has having Davis on the team turned a playoff team into an also ran?
The 2016 team made the playoffs and Davis was pretty good. In fact without Davis that team might not make the wildcard game.
Davis was bad but not terrible in 2017 and the team finished 12 games under 500. I don't think replacing Davis with Cruz turns that into a playoff team.
Since then the team has been terrible and you could replace Davis with Trout and they would still be terrible.
Now maybe those early 90's teams don't go even without the Davis trade, but maybe they do.
I know the current O's would still have to go through a rebuild even without the Davis contract weighing them down.