I think you dont ger what i ams aying, if you are starting 8 cdns, and you want to replace thomas ir lawfon with an american, you can. As you still have the required ratio..If your questioning how the coaches evaluate talent, thats a question unrelated to rule.
With Jones returning he too might be able to beat out an american rookie giving more flexibility. Sure for emergency it might be benificial, but for the teams utilizing it regularly it hampers developement of the cdns Can you give examples of teams using it that gave them a competitive advantage?
Strange that you go directly to insults rather than backing up you comments.