How I rank the pen:
Unknown: Aybar (didn't even make it to the alternate site this year, is a former position player with no control, but is the youngest guy on the list)
Solid arms to keep: Barns, Hernandez
Decent/intriguing arms: Taylor, Brasier, Mazza, Valdez
Up and down taxi squad guys: Brewer, Weber, Springs, Stock
Low upside guys to dump/outright to AAA: Brice, Covey, Hall, Hart, Walden
Dumping the low upside guys plus Puello, Peraza and either Chatham or Arroyo gives them enough room to protect 6-7 guys and pick a rule V guy.