Baker was (and is) literally unhirable because of how he handled pitching.
Well, yes, that was repeated on WNFF for two years, with fingers pointed at some Cubs pitcher who was said to have broken down 20 or 25 years ago. Otherwise, evidence is skimpy. Contrary evidence: Dusty managed pitchers well enough to win 1863 games, a .532 winning percentage over 22 seasons. Dave has won 101 games and lost 111, for a winning percentage of .476.
Dave destroyed the bullpen last year. He wrecked Ryan Madsen, then had a relief-pitchers revolt that Rizzo stopped by trading Madsen, Kinstler, and Kelley. He got less than nothing out of Roark and Gio, who, at least seem better than Hellickson and Sanchez. He has managed this year's bullpen to the worst performances since the 1958 Washington Senators. (They were one of the worst teams I ever followed.)