A-ha! Right answer Will! That's what I was hoping you were getting at.
Bizarre though it may be, in Iowa, during off-season inside-the-school-year wrestling, a coach can work with any high school wrestler except his own. I've had kids in rooms in that situation, in which we put together groups where we would have none of our own kids in our group. We were all teaching the same things, but staying within the rule. And, we did stay within the rules because there might be that one coach there that -- in a tight spot -- might screw the rest of us if the chance came.
The scrimmage rule you mentioned has been legal for as long as anyone can remember. Usually between Sectionals and Districts, four or five schools might get together and and their District qualifiers practice together a couple of nights -- assuming they aren't going to see each other at Districts. Because State starts on Wednesday, I don't know a lot of teams that practice together that week, but we always did between Sectionals and Districts. I was very surprised when I was in Kansas that we couldn't do that.
Most Iowa kids aren't that big on post-season tournaments. There's never been a lot of push for it. Most of them are getting ready for summer freestyle.