The point that I have made and that I reiterate is that it is impossible for Caroline to have excelled in any physical aspect of practice. Period.
But I don't think Geno is assigning playing time to what for what she's doing in practice.
I don't think anyone is suggesting that practice is a competitive stage for playing time, at least in terms of "who plays the best."
I think by practice time, Geno often means "who handles the mental aspect of practice the best" and "who shows me what I want to see."
That's not the be all end all to who he plays...but I think it's definitely part of it.