I'd be happy to talk to anyone about Rich Mullins and will try to contact this source you've now come up with—that no public evidence connects to Mullins or any school he attended.

But know this: you want a stillborn engagement to establish Mullins' heterosexuality, and that's not how evidence of sexuality works.

If the story is that two women considered marrying him and then decided they wouldn’t, then those relationships may prove he had a problem disqualifying him from marriage.