I think for me, heading into the season I'm worried about 3 things
1. There are a lot of old guys on this pitching staff - I am generally agnostic about pitcher age, but even for me it's unnerving that we have more pitchers on the team over 35 than under 25. Shota is the median aged pitcher on the staff! Hodge, Pearson, Morgan and Brown are the only guys on the OD roster under 29! Some of this is a snapshot in time before Iowa arms start percolating up, but in the meantime there will be at least one of the older guys who goes all Kyle Hendricks on us. I just hope it's Rea or Brasier rather than Pressly or Taillon
2. The rotation and bullpen each feel a guy short - This feels a little less true than it did in February because Merryweather and Brown (and despite opening at Iowa, Wicks) all appear to be back at full strength. But still, for all of the great work done to build out this team's depth, unless Jed *really* nailed the Boyd signing this winter was light on adding impact to the top of the staff
3. The bottom half of the batting order has a chance to be a problem - Swanson and Hoerner are coming off injury and as you point out above the youths obviously come with question marks. Individually I expect each guy to end up within a stones throw of average offensively, but simple odds are one or two guys will faceplant. I ascribe to the belief that lineups with gaping holes tend to underperform the sum of their parts (call it the Heyward/Almora theorem). So if we have another situation like last year where PCA and Amaya were both catastrophically bad for multiple months, it could be a really big problem even if e.g. Tucker's hitting like an MVP