Im actually surprised Peacock hasn't made it a closer race. IMO, the top 5, no matter how you rank them is Harper, Rendon, Purke, Cole, and Peacock.
There's a lot more talent but guys like Hood, Meyer, and Norris IMO have bigger pressing questions or haven't proven enough at a high enough level to push any of those guys down.
I corrected the post before you. I lost track where we were. I agree on the top 4. I disagree on Peacock v. Norris because I'm a skeptic about Peacock being more than a reliever. I view Norris more likely to hit for an acceptable average (.240, I/M/O) and keep the power, plate discipline, and his ability to stick in position than Peacock to develop the 3d pitch he'll need to start. But this is based on reports and not watching them.