Of the at least fairly reasonable options, not guys like Degrom who wont ever be available, I think I rank them like this at the moment
1) Joe Ryan- He hits Arbitration next year and Minnesota is salary dumping getting ready for sale, that's the only reason he's possibly available. Over the last two seasons he's posted a 3.24 ERA 3.37 FIP 3.49 xFIP. The cost would be damn near Mackenzie Gore high.
2) Pablo Lopez- Again, the Twins are looking to lower payroll. He's signed thru 2027 at 21.5M a year. This year he's posting a 2.82 ERA 2.99 FIP 3.54 xFIP. Cost would be high, but not quite as high as Ryan EDIT: Was unaware he was transferred to the 60 day DL which removes him from the list.
3) Edward Cabrera- The performance isn't up there with Ryan or Lopez but the upside is probably even higher. He seems to be ironing out his notorious control issues with a career low 3.79 BB/9 this year. 3.41 ERA 3.83FIP 3.80 xFIP. He's not a free agent until 2029 so the cost would still be rather high
4) Seth Lugo- He's a FA at the end of the year which means he shouldn't cost too much. FIP and xFIP have never really loved him but he consistently puts up solid ERAs. 2.74 ERA 4.18 FIP 4.02 xFIP
5) Merrill Kelly- Another rental piece, who has consistently been at least good if not very good in 3 of the last 4 years. 3.55ERA 3.48 FIP 3.49 xFIP
6) Mitch Keller- He's actually a really solid pitcher, not great but good, I just get the impression that due to him being under control through 2028 at a reasonable 16.5M in '26, 18M in '27 and 20M in '28 that his price will be much higher than I can stomach. 3.64 ERA 3.24 FIP 3.93 xFIP
7) Yusei Kikuchi- The Angels almost certainly aren't selling yet, but if they take a turn for the worst he's a guy I'd absolutely love the Cub pitch lab to get their hands on. I really wanted him in the offseason. He's under control through 2027 where he'll make 21M in '26 and '27. 2.81 ERA 3.79 FIP 4.00 xFIP.
Guys I want no part of:
1) Alcantara- The price tag is way too high for a guy who has been mediocre to miserable for a season and a half now
2) Gallen- I don't know if it's mechanics or injury but something is very wrong there in both movement and velocity
3) Eflin- He was hurt, came back still hurt and pitched terribly, now he's on the IL again. It's a shame, he was a guy I had my eye on a month or or two ago as an acquisition.
4) Sugano- His regression to his peripherals has been hard and fast
5) Heaney- K/9 way down, and surviving on a babip 41 points below his career average. I don't think he gives you anything that Wicks, Assad, etc. couldn't give you other than reliable starts.
6) Marquez- Only if the Cubs have a time machine to go back 4 or 5 years
7) Anderson- Same as Heaney, I don't think he gives the Cubs anything they couldn't find internally other than a guy who's a pretty solid bet to make his starts