Wow, this couldn't possibly be lazier. Actually yes it could, you could say "well...I've only ever seen him throw 2 pitches so.....". But come on man. Every scouting report that exists says that Burnes throws 4 pitches. Throwing four pitches in the minor leagues is much different than throwing four pitches in the Major Leagues. When Burnes has pitched a full season deploying all four pitches with success against Major League hitters I will consider him a four pitch pitcher. If the curve or change up were currently as good as the slider, I believe they would have been thrown more even in relief. If Corbin starts next year, pitches 175 innings & throws 50% fastballs, 30% sliders, 10% curveballs & 10% change ups, would you consider that a four pitch pitcher? Because to me, that still looks like effectively a two pitch guy. Even if 10% usage is enough, there were only 15 qualified starters this season who had four pitches each at 10% usage or higher, so the four pitch pitcher appears to be pretty rare at this point. As long as Burnes can throw those 4 pitches for strikes, then yes that is a 4 pitch pitcher. In a 10 pitch at bat that would be 5 fastballs, 3 sliders, 1 curve ball, and 1 change up. Do you expect pitchers to throw ever pitch equally? The point is to keep the hitter off balance.