You want a bunch of guys like Brewer, Valdez and Politi (plus several others) as a second tier of depth, in hopes that one or two contribute in a meaningful way, and we don't get killed going through a trial and error process until we find one that helps.
We all had hoped none of these guys would be on the opening day roster or even the first to be called up, but with Sale, Brasier, Barnes and maybe Cordero all out to start the year, it looks like some of these guys will be bumped up to first tier replacement players for us.
Brewer and Valdez have both shown some ability to get enough batters out to be a slight plus, but I would prefer not to count on them to do so.
Bloom has vastly improved our 40 man roster depth, over the winter, but there are still holes, and the bottom 4-6 players on the 40-man are not all that promising.
We knew Sale was going to be out, and we expected we'd have some issues with Eovaldi & Richards. The spring games took away some of the doubt about ERod, until the dead arm issue occurred. The 8-9 man pen all looked healthy, but when you have a group of 8-9 players expected to be on the 26 man roster, you have to count on 1 or 2 being on the IL at any given time. One could argue our "counting on that" was not sufficient in the pitchers we have slotted 9-11. (Even our 8th guy, Brice, is highly questionable, and our #7 Taylor is somewhat questionable.)
Here's a rough idea of what our pitching depth charts looks like:
SP
(Sale IL)
ERod (out and possibly on IL)
Eovaldi
Richards
Perez
Pivetta
Andriese or Whitlock (spot starters)
Houck
Seabold
Gossett, Hart, Ward, Politi, Kent, Winckowski/German
RP
Ottavino
Barnes (C-19 list)
Brasier (IL)
D Hern
Sawamura
Andriese
Taylor
Brice
Whitlock
Valdez
Schreiber, Walden, McCarthy, Bazardo, Poyner, Ort, Blair, Feltman
Our pitching depth looks to be our weakest area, despite Houck and a few others having some promise.