If the pitching additions ( Crochet, Buehler, Chapman et alia) and injury recoveries ( Hendricks, Whitlock , Giolito, etc) come through with career average performances, combined with no loss of production from Bello, Houck, Crawford ( role TBD) , then this could be a high 80's win team competing to the end of September.
OTOH, amongst the many pitchers ( 24) currently on the 40 man roster, how many of the top 13 expected on the 26 man active roster will make it out of June with no significant injury. For that matter, how many will be available to pitch at the conclusion of ST in late march.
In fact if you consider Chapman and K. Jansen some what equal talents, the BP will be the weak spot on this team, potentially boosted by Whitlock and Crawford possibly.