I'm hoping that someone local can clear this up. I've read that Villa Maria is a college prep day school for grades 9-12. Here's the history of the school:
http://www.vmahs.org/about/About VMA.html
Then I noticed that there was mention of a Lower School in 1979 and found this:
http://www.villamaria.org/
This discusses Kindergarten through 8th grade. It's important to know just what ages were taught at the school site when Rhoads was there, IMO. And not just what students he might have personally taught in his classes but what age students were on site or involved in the sports programs, as he seems to have a long history of coaching.
IMO, the net needs to cast as wide as necessary to find as many victims as possible.