I think these would be positive changes. Imagine this season, had they forced us to pick one of TJL, Riewoldt, Hawkins, Cox, De Goey, Dixon, JJK, Darling, Cameron, for example, and you could only trade him out for another KPF. If they did it for KPDs as well, I think it would lead to more unique players in SC match-ups (always more interesting imo), and would also align with the situation at actual clubs, where a given club might have a gun KPF but a rubbish KPD.