What if those scrubs will be 18-year-old HOFs? It would be unfair..
This is simple - make them all have the lowest possible potential and all atrocious skills.
On the whole this suggestion is too complicated to come true, especially with injury reserves.
It is not more complicated than any other part of the game. And it makes it more of a managers game. I play a text-based football game that has a similar rule for the injury reserves. No one has ever complained that the rule is complicated.
Run of the Mill Canadian Manager