I think it's just a parallel drawn from soccer that doesn't really fit. It is common for teams to send young players on loan to smaller teams so they can get minutes and develop, so I imagine that this was on the back of the mind of the people who proposed it. The idea would be that big teams would loan out young players to smaller teams where they could play regularly without hurting the team. But as other people, you, and me discussed, it is a highway for cheating and other problems