There seems to be an inherent assumption that another several months or a year at AAA will materially aid in the development of Iglesias' hitting and/or that his failure at the big league level at the plate would materially retard his development as a player.
I don't buy either assumption. To be clear, I don't doubt that more practice games could help Iglesias' hitting, but I don't think the difference or perceived gains is worth the delay.
If I understand you, TS, you're saying that hitting against tougher pitching will not slow down or derail his development. Would you assert that as a general principle--i.e., hitters will tend to develop at about the same pace regardless of how quickly they're moved through the system, so the only reason not to rush them is to avoid being plagued by their suck in the short term--or are you saying it about Iglesias in particular?