2003 - terrible defense, 28th in bullpen ERA (bullpen by committee), 3rd offense
2004 - terrible defense, but they win because they had a healthy starting rotation all year and the bullpen pitched lights out in the playoffs
2005 - 4th offense, terrible defense, 18th pitching staff
2007 - 2nd in team ERA, lights out bullpen, only injury was to Schilling
2011 - 2nd offense, 16th in pitching, 7th in defense
2013 - starting pitching was healthy except for Buchholz, top 10 defense
2018 - top 5 pitching staff, top 5 defense
2019 - 6th offense, 12th pitching, 5th defense
I think punting on pitching would be a bad idea. They could get away with a bad defense, but would need to have a really, really great offense (which they don't have).