This has been explained 1000 times. I’m seeing some annual pot stirring by CJ in this post.
It had to do with an agreement reached by the Archdiocese schools, Brebeuf, Guerin and, originally, Cathedral. It wasn’t about Catholic v Non-Catholic enrollment- it had everything to do with how athletes in CYO schools could be contacted and how they could not.
Coaches could talk to CYO teams as a whole in favor of coming to their school but no recruiting individually by coaches…no phone calls, etc. Archdiocese schools were limited to their feeder schools but the non-Arccdiocese had no limitation EXCEPTING there was to be no direct INDIVIDUAL contact.
Coach L back in the day couldn’t even individually promote Chatard football or talk in any way about it to kids on the Spring day they signed up for classes at Chatard. I know it because I witnessed it on the day of sign-up.
All these schools had agreed to it until Cathedral reneged. Roncalli responded as they did because of it. As much as I am not so “down” with the Royals rename I totally respected Roncalli’s decision back then….still do.