Hmm. I always though cutter and 2 seamer were synonyms. Maybe cutter goes one way and two cuts the other.
Regardless. I am also in the corner of Wilson being able to improve. If he were fried or Newk sage then nope. But at 21. I think there is room to grow. That said I still would bet he ends as a high end reliever.
A cutter (FC) is a fastball that moves glove side...sort of like a very hard slider (SL).
A two-seamer/sinker (SI) is a fastball that moves arm side and sinks...sort of like a hard change (CH).
A four-seamer (FA) is supposed to have lots of backspin and appear to rise...even though that's physically impossible.
A "flat" FA or SI is one that has vertical movement right around 7". Those fastballs don't "rise" enough to be a good FA, and don't "sink" enough to be a good SI. They just kinda sit there waiting to be crushed because that's the type of movement most mediocre fastballs have.
How sliders (SL) and curves (CU) are precisely grouped isn't exactly clear, but curves typically are slower with more downward break, and sliders are typically harder with more glove side movement. It is easy for pitches to let these pitches overlap and throw a "slurve".
These are just the classifications based on movement since a cutter and sinker and slider are all probably held with a 2 seam grip. They are the terms I've seen generally accepted by the "experts" who talk about them, and are the pitch types listed by FG, Pitchfx, Pitch Info Solutions, and Baseball Savant (Statcast).