That probably accounts for the size of the range, but there is no cluster or pair of cluster pattern in the blob. It's likely that's what keeps hitters off balance. Even if they can quickly identify the pitch, there's a wide difference in final location. The down side is that Peralta dosen't always have the best control. If he could hone his control without tightening his fastball cluster too much, he will be really tough to hit. With AAA somewhere reasonable this year, it may well be worth putting him there for a month or two.