This has happened twice now in my league: a pitcher who was previously a top pitcher, like ERA under 3 and league-leader in a category or two, is signed like a starter like that (top 5-10 contract) and then moved to middle relief without a chance in the rotation. Have you had this happen and is it an evaluation problem? I'm close to default for fictional leagues.
Here is the most recent one, big signing:
low stamina, but he's always had that. Still a 4-star, AI evaluation is 30/50/15/5. Scouting accuracy is normal.
Here is the 5th starter who for some reason is in the Memphis rotation ahead of Roux
What would make a team spend enormously on a guy then relegate him to mop-up duty. It's now happened twice in 2 offseasons