Agreed. When I was coaching last year, I stood next to him and he was clearly at least 6'4" with shoes on. I'm assuming he is a little taller this year.
Putting a positive spin on Joe's potential, I look at him as a more polished Chip Armelin. He is taller, stronger, and has a better stroke than Chip. Joe has dominated at the high school level, something that Chip did not do (from what I can tell). I am excited to see them both on the court slashing and getting to the line a lot.
Also, for people that haven't seen Joe play, you will be pleasantly surprised by his competitive streak. He is a feisty player on the court, and likes to mix it up. He tries to dunk on everyone. Compared to his older brother, he is VERY aggressive. I'm excited to see him play.