Bundy threw what looked to be an outside pitch, but it was high and not low. Can't throw any high pitches to Gary since he can elevate them and he has the power to go opposite field in that bandbox. This was his first YS3 special. Pitchers are going to have to keep the ball at the knees to keep him in the park, and preferably outside.
That said, Garys minor league numbers don't suggest this kind of performance. A lot of people were asking the same questions about Trevor Story that are asking them again with Gary Sanchez.
Story was a guy who hit 10 HR in April which matched his minor league total for HR in all of 2015 (over 500 AB) , almost half his AB coming in the hitter friendly PCL. In 2016, he hit 4 of his first 10 HR at Coors, but it is April so the cold takes away some of the altitude effects
Since April, his HR rate stabilized and he hit 17 HR in 280 AB. Still well above his minor league rate, but no Babe Ruth
Gary is of course a guy known to have some power, but he only had 10 HR in 285 AB in Scranton. Now he has 11 HR in only 80 something AB in MLB. Todays HR was his first YS3 special, almost all of his HR have been 400+ ft blasts
We have also seen similar surprises in terms of power from Travis Shaw and Greg Bird last year, power numbers that surpassed their minor league production the same year.
One theory is the MLB ball is juiced relative to the minor league ball. This is why some guys who hit a lot of fly balls increase their HR production when jumping to MLB, at least those who make contact do. Gary, like Story will have some regression in their HR rate, but the MLB ball will keep their power numbers elevated.
Here is the link to the report showing the differences in the ball. Its a bit dated, but I see no evidence the balls are the same now.
http://baseball.physics.illinois.edu/UML2000.pdf
"The Major League balls are manufactured in Costa Rica and have a compressed corksphere per the specifications. The Minor League balls are manufactured in China and have a cork center as specified in “1996 Minor League Baseball Proposal”. This cork center is the likely source for the decrease in performance, which results in a comparable Minor League ball hit of 391.8 ft under the same conditions as the Major League balls. Small samples of 1998 MLB baseballs were also tested. The 1998 MLB baseball had a comparable batted-ball distance of 400.5 ft.
This article supports the theory as well
http://fivethirtyeight.com/features/are-juiced-balls-the-new-steroids/