Hot Stove League Update: Giants Acquire Minor League Pitcher And Claim Catcher Off Waivers

There are two more transactions to report from the Hot Stove League.  On December 28 the Giants signed Miguel Diaz RHP to a minor league contract and on January 8 they claimed Sam Huff C off waivers from the Rangers.  Since claiming a player off waivers necessitates putting them on the 40-man roster they designated Austin Warren RHP for assignment.  The Churn is alive and well.  Let's breakdown the players involved:

Miguel Diaz RHP.  DOB:  11/28/1994.  6' 0", 224 lbs.  

2024(AAA- 2 teams):  3-2, 4.30, 46 IP, 10.57 K/9, 3.33 BB/9, 4 Saves, 2.48 FIP, 3.65 xFIP.  

Diaz pitched just one scoreless inning at the MLB level for the Astros.  He has a 2.82 ERA in a total of 60.2 IP since 2019 but has had limited opportunities since 2021 when he pitched 42 innings.  Scouting report is he has a mid-90's FB with a changeup and slider.  He has a modest groundball tendency.  He is on a minor league deal presumably with an invitation to spring training.  He is out of options. It is unclear if players who sign as minor league free agents must be exposed to waivers if they do not make the active roster out of spring training.  

Sam Huff C.  DOB:  1/14/1998.  B-R, T-R.  6' 4", 240 lbs.  

Career(MLB):  .258/.313/.455, 10 HR, 7.5 BB%, 33.6 K%, 214 PA.  

2024(AAA):  .246/.310/.416, 13 HR, 8.2 BB%, 31.4 K%, 477 PA.

Very big body for a catcher which scouting reports say negatively impacts his framing and defense.  Has managed to put up decent slash lines despite high K rates.  Also out of options but signed as a minor league free agent so unclear that he needs to be optioned to be sent to AAA.  Otherwise he fills out the spring training roster with an outside chance of winning the back up catcher role at the MLB level.

Austin Warren RHP.  DOB:  2/5/1996.  6' 0", 170 lbs.  

2024(minor leagues- 3 levels):  1-1, 4.67, 27 IP, 10.33 K/9, 2.00 BB/9. 1.67 GB/FB.

2024(MLB):  0-0, 1.69, 10.2 IP, 5.91 K/9, 4.22 BB/9, 1.60 GB/FB.

Warren was signed as a rehab project after missing almost all of the 2023 season.  He put up excellent K and BB rates in 3 minor league levels but with a relatively high ERA.  In 6 MLB appearances he had a shiny ERA with terrible K/BB.  Is Huff more valuable on the 40-man roster than Warren?