Throws both a 2-seam and 4-seam FB. More often 2-seam, that generates plenty of ground balls. Has massive plane, and spots the pitch well. Pitch has run and sink, often generating weak contact when down in zone. Pitch has life as well.
Two plane break, with hard torque. Go to pitch, that has plenty of spin and late movement. Swing and miss pitch, and bread and butter out pitch both at present and future. Will continue to gain command of the pitch, and with even more advanced sequencing, will play up to a true plus pitch at MLB level.
A bit slower than slider, and can be used as either chase pitch or thrown for a strike. Has 10/4 shape, with tight spin.
Threw it during backfield sessions more frequently. Doesn't yet trust it in games. Has some run and arm side fade. Can fail to throw it with conviction, but is a work in progress. As he continues up the latter, should develop enough feel to make this a major league average pitch.
Thompson is a large, physically maxed out 20 year old kid, who projects to be a mid-to-back of the rotation starter at the major league level. He's got mound presence, feel for sequencing, and a high pitching IQ. He can pitch backwards, and throw either breaking pitch for a strike in any count. His fastball command is very good for a prospect his age, and will continue to get better. If he can continue to hold his velocity into the late innings, which has been a concern so far, he should have no problem throwing 200+ innings at the major league level. If it doesn't work as a starter, he'd absolutely be able to contribute at the back of a bullpen.