8th grade football players are allowed in those situations (schools) you mentioned. But no I am talking about 5th year seniors (5 years in high school) or players over the age limit. It is one of the reasons the Indy Conference schools are Associate DIAA members and not full members, The deal is those players (ones that would be ineligible at full member schools) can't play vs DIAA full member schools but of course they can play vs each other or out of state independent schools.
The latest situation I can remember was the big center (Big Ben) at St Andrews. He had to sit vs full DIAA teams and out of state member teams. St Andrews even had to FFT some games OOS when he played when he shouldn't have.
The couple fft losses OOS were because those teams were state associated teams and the player played. Of course he was not eligible to play in the DIAA playoffs either. No way they lose to Dickinson if he could. just saying
2013-2014
Tatnall had a real good BB player (Cooper) a few years back that was the same situation.
I am sure there are many others through the years but those are the high profile ones I know of or remember