Mitch Keller is no top of rotation starter, but he'll be just 29 in April. The Pirates extended him, and back-loaded the deal, so they appear to be looking to unload him, already (year 2 of a 5 year deal.) He'll be 33, when his contract ends. His tax hit is a reasonable $15.4M. (He'd get more as a FA.)
His 3 year numbers: 4.13 ERA (103 ERA+) 3.92 FIP/1.31 WHIP with about 9Ks and 3 BB per 9IP (1.1 HR/9)
Here is how he ranks among 153 SP'ers with 200+ IP since 2022:
15th in IP at 525 and 14th in GS, so looks durable & dependable
35th in fWAR at 7.5 (avg 2.5 per season) Near Wacha & Bassitt
59th in xFIP at 3.91 (Near Flaherty, Monty and Bello) 63rd in FIP at 3.93
77th in ERA- at 97 (Near Singer, Rodon, Monty, Flaherty & Stroman)
By the rankings, he looks like an okay #3 SP'er, with a solid workload that pushes his value up to maybe an okay #2.
So, to me, he looks like an upgrade over Crawford and Giolito and maybe Bello, depending on what direction Bello takes. I'd like him in our rotation, but would prefer we just sign Burnes or not have to give up anything and just sign Flaherty or Manaea.
What would it take to get him? His salary is a drag on PIT's budget: $15,4M>$16.9M>$18.4M>20.4M, but he's not a "dump."
I certainly would not give a top 3 prospect for him, and would hesitate to give up Arias, but I would consider Abreu or Bleis, Cespedes or JH Garcia. I'm not sure they'd take Rafaela, even if we added DHam.
If we were looking to expand the trade, maybe asking for switch-hitting Reynolds to play LF might be a fit, instead of signing Teoscar or Santander. His career splits are .842 vs R and .772 v L, so he does not really fit the big bat v LHP need. He turns 30, soon and is signed through 2030 at a tax hit of just $13.3M. His pay goes up, too, but not as quickly as Keller's. I'm not sure I really want him. I think I'd rather keep Abreu & Rafaela.