I cannot speak for any of the other leagues but the Pioneer doesn't use a true form of the "4 sport" season. Thus the two winter seasons overlap by a week or two. In a true version of the "4 sport" season there is no overlap. We have been working for years to get the Pioneer League to change and are getting closer. As Mr. Salyer said, the merger of the AV and CTL will allow for many changes in the near future of those districts middle school leagues. So, it is important for all of us to make our desires for change known.
In the iterim, as has been noted before in other threads, some middle schools/coaches allow those students participating in kids wrestling to not report for middle school practice till after Tulsa Nationals each year. This allows them to attend most of the national tournaments and not miss any of the middle school season. Following the middle school season they can return to kids competition right in time for sub-districts.
Always try to include your high school coach in any attempts to implement change in the middle school. They can be a big help!