Daniel Cabrera was a 3 year SEC starter and then in his first pro games in A+ he had a .695 OPS. Not great, but totally fine production, but then the organizational geniuses decided to give him a month in AA and he tanks. Back at AA, he has been even worse. The best you can say is he's stalled, but the current results are just awful.
He is literally the worst player in the Eastern League (min 100 PAs)