Why should the quality of pitchers matter on the amount of balls in Simmons zone? Unless our pitchers in years prior had the ability to make the batters hit the ball there. The simple solution is that wasn't Simmons true talent level and was just a freak season. Just like when someone has a super high BABIP in a given year. Simmons actual talent is likely at 20+ runs saved per year.
That's the question I'm asking again. Are there more balls hit in his general vicinity this year that are just outside his zone than before? You're asking someone to solve the problem without giving them all the variables in the equation. Are we shifting more this season? Has the infield been in trying to cut down a run more often? Have those things led to more balls landing in the outer edges of his zone that he'd gotten to before?
You're asking someone who hasn't had the criteria you're using explained to them to just take what you're saying as gospel when half of the MLB front offices don't.
We all get the part about career years and don't necessarily disagree with what you're saying overall - we're just asking you to explain it in a way those who aren't as statistically-inclined can understand. Having disagreements just because you've looked at a chart that others have no clue what they represent (much less what they mean) is what seems to cause a lot of the disconnect. At that point you may find that a big chunk of people that aren't convinced right now might become more convinced.