Here's what the statcast data says about Ritchie's stuff:
CU: 82.0 mph, 14.5" glove, -12.8" rise
This pitch has above average horizontal (2025 MLB avg 9.2") and vertical (2025 MLB avg -10.1"). This is easily a plus or better pitch, and it was clearly his best pitch based on the eye test.
CH: 88.3 mph, 12.4" arm, -0.4" rise
This pitch is a little too firm compared to the sinker, has below average run (2025 MLB avg 14.4"), but above average sink (2025 MLB avg +4.5"). Average pitch overall with room to improve.
SI: 94.8 mph, 14.9" arm, 5.6" rise
Above average velocity (2025 MLB avg 93.8), average run (2025 MLB avg 15.2"), and above average sink (2025 MLB avg 7.5"). This is another above average pitch.
FC: 90.7 mph, 1.9" glove, 7.9" rise
Above average velocity (2025 MLB avg 89.7), average glove-side movement (2025 MLB avg 2.1"), and average rise (2025 MLB avg 8.2"). Yet another above average pitch.
FF: 95.9 mph, 5.1" arm, 15.6" rise
Above average velocity (2025 MLB avg 94.5), below average run (2025 MLB avg 7.8"), average rise (2025 MLB avg 15.8"). An average pitch, much better than I assumed.
SL: 82.9 mph, 14.8" glove, -2.4" rise
Very slow (2025 MLB avg 86.1), massive glove-side movement (2025 MLB avg 4.5"), and great sink (2025 MLB avg 1.8"). This is more like a quality sweeper with some sink.
So overall he has a great curve, an above average cutter, sinker and sweeper (I would not call it a slider), and an average 4 seamer and change. I suspect the change will improve as he gains feel to lighten up on it a bit. These sample sizes are tiny, but calling him "Schwelly-lite" seems very accurate, and he certainly has potential to be a MOR guy if the command/execution pans out and he holds his velocity.