I think there may be an actual solution to this that doesn't break matchmaking. And since the op doesn't seem to understand how the system works let alone how to make it better, I'll throw out the possible solution for Discussion.
Basically we just need to redo the division placement to also be based on effective go with matchmaking rather than total gp. This would likely result in people who have vastly different rosters at the top being in different divisions.
It's a bit more complicated unfortunately since what determines effective gp varies based on your division. But it is something to consider since there are calls to rework the divisions anyway due to division 1 filling up.
