On court impact wise I agree, but market value wise, higher potential trainees could have significant worth after two season's of training 1on1 - but good luck on trying to sell pot 7 players with 2 season 1on1 training. It's just not economical.
back to my original point: OP has 2 pot 7 trainees, if he is intending to train them one on one, it's largely a waste of time and resources: they will not be worth much on market in two seasons and he won't be able to use them with much positive result on court.