i.e. If you want to apply a rigid average definition here, it won't make sense because several role and maybe some scrub RPs will be in that category —which will not make sense because it is not how it works.
The way I see it, FG does not care calling more than the half of the RPs per year, role/scrub RPs. If you suck you suck, it doesn't matter if a lot suck too.
Maybe the later will help you to understand how it does actually work in order to give a RP a pedigree — which actually makes sense, because most of RPs are role/scrub/replacement players.