Don't read too much into MiLB stats. They are an indication, but how many times has a guy with great MiLB stats busted, and how many times has a guy with s***** MiLB stats become a star. Plenty of times for both. It's been well reported that mid last year in Buffalo an adjustment was made that has worked.
Bautista made an adjustment to his batting and became a superstar. It can happen to any player at any time. Not saying Sanchez has found a repeatable delivery that works in MLB, but the signs are encouraging.
Also, his BB and K rate are now identical, and trending in the right directions.