Keith Law has two Cubs in his top 20 prospects likely to make an impact in the MLB this year
The first is easy, Busch, who barely qualifies.
The 2nd is not Horton, but Shaw. Law thinks the Morel "experiment" will not work and Shaw will be taking ABs in MLB this year.
Law is not going out on a limb with those predictions, but I think Horton (if all goes as expected) will have a much bigger impact.
https://theathletic.com/5335070/2024/03/13/mlb-rookie-impact-projections-2024-season/