And the 6'6" in my opinion, looks like he can be great all around.
I'm in a doubt with this height. He's too tall for guard training, and to short for big man training. Don't you think so?
I don't know I've been training a guy that is 6'7" and yes his big man skills do train a bit slower, but I think it is a good height for a PF. You will be able to add on the couple of side skills for him to be good.
And just to let the guy know my 6'7" guy trained in big man skills for 2 seasons and just hit 13k salary at the start of this season. So I wouldn't expect him to train fast, but if you are switching skills back and forth during the season he will still steadily become better.