While this is a Gunnar thread (and I’m very pleased to see the Os keep him at SS where he will be/already is a plus defender), I wanted to comment briefly on some of the other players mentioned.
In the 3/14 game I saw in person against Pitt in Bradenton, Mateo looked VERY good defensively at 2B. A super utility with speed can be valuable, and if he hits OK in 2024 I could see Mateo remaining on team in 2025 with Mayo displacing Urías.
In the spring training action and highlights, Holliday also appears very comfortable at 2B and his hands + throwing on the run at different angles. And it is apparent he prefers throwing on the run to use his smooth athleticism. Have yet to see him plant right foot and fire a throw from the hole, in fact some of his throws in 2B hole and double play pivots are of the jump variety. And in terms of CF possibilities, you usually see guys move from INF to OF when their hands are questionable and Hollidays are one of his better traits.
In the 3/14 prospects game, Bradfield looked AMAZING defensively in CF. Playing very shallow the whole time. And when liner over his head went to warning track, he was able to turn and absolutely fly to the ball when I thought he had no chance. Yes TBD on whether he will hit enough.