He has improved, recently, but when you look at his full career- minors and majors- he barely moved the needle, at all, until very recently. He has such a long way to go in this area, that it is probably impossible he can ever get to even a respectable level on K zone discipline.
His current career OPS is .705, and he is still very young. If he has a long career, he could decline as he gets past 30-32, but I gotta figure he should have a higher OPS than .700 as he get to peak prime years.
It will likely keep him from ever being able to stay near or over .800, even for several seasons. He might get close for one season, maybe this year, but unless he keeps improving as much as he did, this year- over and over again.
On another angle, there are a few players who have very high K rates, but still put up very good OPS. Most have much higher BB rates that Rafaela has even come close to doing, so I can understand thinking he'll never get there. I have serious doubts, too.
Here are a few High K batters who are over .770 career w BB%.
.820 T Story 28.2 K%/ 8.0 BB%
.802 Teoscar 29.2%/7.0%
.774 Chris Davis 32.9K%/ 9.9% BB%
Rafaela is .705 with 24.2% K and 3.4% BB. What's hard to gauge is how real is this year's improvement and can or will it continue. Last year he was at a 26.4% K rate and 2.6 BB rate, which was maybe the worst in the history of MLB. Then...
26.4% to 18.8% K rate from '24 to '25
and
2.6% BB% to 4.5%
He's got power, so his SLG can carry him a bit, but he is not likely going to be Teoscar with power. 4.5% BB rate is far behind the 3 players I listed.
Looking at the worst BB/K numbers with highest OPS, since 1972, I found.... (Rafaela's is .14 career but .24 in 2025.)
.20 Y Diaz .760
.21 S Perez.762
.23 D Dahl .773
.24 T Carpenter .832 (just 1148 PAs)
.24 Bo Jackson .784
.24 Teoscar .802
It is a rare thing to see: I admit.
I think we have to hope he can improve on 0.24, otherwise he will be one of two guys in over 50 years to hit over .800 and have that bad of a rate.