Based on kids who have graduated in the last few years (so this is anecdotal – I don’t know more than a handful), the culture at Pingry is quite competitive. I thought Delbarton had a very good baseball program – is that no longer the case? Did you look at Gill St. Bernard’? Several athletic kids we know have gone there but I don’t know much about their academics.
I’m confused by your comment about Delbarton "Started accepting more kids last year and not all stellar. " If you know kids who do not have good character or values, you may want to consider whether you think the school would be a fit for your son, but if a school of that size has an academic track that will fit your son, why would you be worried about less academically able students?