IF he wants to train him, 6'6 is quite tall for a guard, that's true (though I got 11 ups from outside training last season on two guys (20 & 21 years) who are that tall, and one week was stamina training).
But if he just wants him to play, the player might just as well be 7'5 or 5'8, it doesn't make a difference.
We have both said a lot of things that you are going to regret.