My pessimistic expectation for Bobby Dalbec resembles my pessimistic expectation a year ago for 2020 AL Rookie of the Year Kyle Lewis.
Here are their stats from their brief MLB debut seasons:
2019 KL 18 G, 75 PA, 10 R, 6 HR, 13 RBI, .268/.293/.592/.885, OPS+ 131
2020 BD 23 G, 92 PA, 13 R, 8 HR, 16 RBI, .263/.359/.600/.959, OPS+ 152
Their 2021 ZiPS projections:
KL 122 G, 472 PA, 51 R, 15 HR, 54 RBI, .227/.282/.377/.659, -0.2 WAR
BD 121 G, 447 PA, 57 R, 21 HR, 58 RBI, .217/.302/.409/.711, 0.8 WAR
Their 2021 Steamer projections:
KL 149 G, 650 PA, 71 R, 22 HR, 75 RBI, .231/.309/.393/.702, 1.5 WAR
BD 133 G, 531 PA, 68 R, 27 HR, 74 RBI, .234/.318/.456/.774, 0.6 WAR
... and their 2021 Marcel projections:
KL 534 PA, 76 R, 24 HR, 68 RBI, .257/.343/.452/.795
BD 324 PA, 43 R, 16 HR, 45 RBI, .249/.336/.470/.807
FWIW Dalbec is two weeks older than the 2020 AL Rookie of the Year.