I actually cited this study way back in the first few pages of the post, I guess you just never bothered to look closely at it before.
You might just want to go back and review the actual claims you made. For example, you claimed that Wieters faced a tradeoff of hitting 30 HRs and batting .260 or .300 and 15 HRs. The chart clearly shows that the BA change is nowhere near that level of dropoff, even as slugging percentage increases. Further, you claimed that 6'3" was the "sweet spot" and that after that players faced a tradeoff with BA dropping and slugging increasing, while below that slugging dropped and BA rose. Again, the chart shows that's nowhere near close to the truth of the situation.
I've corresponded with the writer before and have dropped him a note to clarify the exact size of the drop beyond 6'6" and whether it is statistically significant. I forgot to ask whether he has broken the chart down to eras, because being 6'6" in 1910 is a very different thing than being 6'6" in 2000.
Of course, the important fact that your claim was applied to Matt Wieters who is 6'5" should not be forgotten. As the chart shows there is NO dropoff in BA at 6'5".
I still stand by my prediction (guess) that home run/average slider will apply to Wieters this year. He's only 22 years old. It will be his rookie year. Either he keeps his cool and focuses on BA or he folds under the pressure and starts swinging for the fences. He just may be that special player that everyone wants/expects him to be and proves me completely wrong. Maybe he pulls a Pujols.
Historically, my "sweet spot" claim doesn't hold water. Point conceded. But, most of the power/average guys of the last 10 years seems to trend toward that hypothesis.
I would love to know the numbers behind the study. I doubt it will be a large sample size as you suspect. But, in my mind, that just goes to prove how hard it is for a guy in those height ranges to even make it to the MLB in the first place. It's also possible that athletes in that height range are more drawn/pushed towards Football and Basketball where their height would be more of an advantage. That would be a whole different study though.
And finally to wrap it up. As the chart shows, historically there is indeed a drop off in batting average for players over 6'5. My original hypothesis was that height affected BA as some point. That is the whole reason we are talking about any of this right now.
So, historically speaking, Wieters has just a good of a chance to hit for a high average as most players. He is in fact 6'5. And therefore, the historical dip in BA does not apply.