Wikelman had a high BB/9 going back to A ball. Unless you've actually seen the guy pitch, I'm not sure how you can provide a scouting report like this. A starter that has velo in the mid 90's with a slider/curve/changeup mix can get to AAA if the 4 pitches are average.
This is what BA said about him:
While he has a four-pitch mix, Sandlin relies most heavily on the mid-90s fastball that touches 97 mph and has above-average ride. Sandlin’s preferred secondary is a mid-80s slider with horizontal break and high spin rates. He also throws a low-80s curveball with two-plane break and bite, and he mixes in a changeup that breaks like a splitter as well. He’s still refining his arsenal--especially his secondaries--so there’s a chance they continue to improve. The fastball and slider are above-average offerings right now, and some believe he may profile best in the bullpen, where he can dominate with those pitches alone.
He may end up being a bullpen guy, but saying hitters should lay off his splitter or cutter when he doesn't throw one is wild.