Bad first half? If I remember correctly, he had only one good month, Aug. Sure, Sep was better than the first half, but he wasn't at the end of the season.
In 2022 and 2023, he was like top 5 pitcher in the league. He wasn't as good in 2024, and got a lot worse in 2025. So, if we're talking about just this year, there's a good chance Jamo (if healty) will be as good, if not better than Gallen.
I agree with you about the last part. If the Cubs can fix him, he would outperform Jamo. If Gallen can go back to what he was 3 years ago, he'd be our ace easily. If they sign and fix him, that would be great, but I'd be fine with passing on him. Probably, I'd be happier, if they sign him (but not for one year), as long as they don't trade Jamo, at least until the deadline. That way, we could see who's performing well and healthy. At the TDL, we could trade one of the SPs for a bat, a closer or anything that we need at the time, if most of our SPs are healthy.
We'll find out soon.