https://www.fangraphs.com/fantasy/freddy-peraltas-fastballs/ This is the article I believe you are referring to with Peralta. He throws a mostly straight 4 seam, and a cut fastball that comes in a couple MPH below the 4 seam. The cut fastball has significant cutting movement, while the 4 seam is pretty straight. The 4 seam doesn't really break as far arm side as you seam to imply. This is somewhat the type of repetoire that Kluber uses, except he actually does have 2(possibly 3) fastballs that break the opposite direction(the 3rd would be 4 seam/straight), along with a breaking pitch. Kluber throws most of his fastballs in the 92-95 range and commands it all very well. Kluber is much moreso the exception than the rule, it's not common for starting pitchers to be so dominant with a number of different fastballs and a good breaking pitch. Unless his changeup comes around(which he's young, it absolutely still can), he'll have to become more of a fastball artist like Kluber to find consistent success as a starter. Another example I can think of is Jake Arrieta. Throws a sinker/slider, curve, and occasional changeup. The slider is has more movement and is a bit more of a change of pace from the sinker than Peralta at this point...but it's pretty close. The basically 3 offerings(excluding changeup) worked for Arrieta for a bit, but once his velocity dipped he had to adapt and started throwing more changeups. I guess my point in outlining that, yes he does technically have 3 pitches...4 if you want to count the changeup. But those 3 pitches might not be enough as the 2 fastballs aren't quite as different as other similar examples. You need a better way to keep guys off balance...the changeup is probably the key for him.