1) Senga's a box o' chocolates. Could be great, could be awful, But one thing he's consistently been is fragile. So I don't know if he'll have a full season, let alone a breakout one.
2) Semien is a sunk cost. He'll get the most time at second even if he's not hitting. Baty will be bouncing around and get plenty of at-bats, but I don't think he unseats Marcus. They've got three years of him. Maybe this happens in years 2 or 3, but not the first year. If he steals time from anyone it could be Polanco.
3) Alvarez had 25 homers in '23, but then the league learned how to pitch to him. Only if he shows plate discipline this year can he get to 30. I'm skeptical. 20, yes, just on raw power. 30? Probably not.