It's a ridiculous situation that clubs under common ownership can loan players between them without there being additional commercial checks in place, but equally I think it would have been wrong to have introduced a rule urgently now for this specific case. Doing so would set a precedent under which clubs could reasonably easily change the rules midway through a season if something happens which they don't like, which seems wrong to me. This should have been resolved over the summer. That hasn't happened, so it needs fixing next summer.