In my opinion Aoki IS a reverse platoon player (most likely), the same as Ichiro, it's because of their unorthodox hitting style. You may have some case with the BABIP but I still say he's a reverse platoon type. You said your regression calculations don't see him with reverse splits but regression calculations don't see anyone with reverse splits; which goes back to my original point. You said 2500 PA is enough to see Ichiro at face value but actually the standard regression formula doesn't work that way. If you're regressing with 2500 PA against 1000 PA of league average you're still regressing against about 25% of league average (non-reversed splits) which would actually be wrong.
By the way K and BB rates are changing with parks (i.e. thinner air makes for less break on balls and vice-versa), and that's why SO/BB rates are included in Park Factor data.
http://www.fangraphs.com/guts.aspx?type=pf&season=2014&teamid=0&sort=7,d