The height of your players may mess up training speed. 6'9 is just not that tall. Ideally a center would be 7ft+. You only want a shorter player when you want to train guard skills. PF train shooting and passing faster because usually they are shorter. Centers, though, don't need those skills as much. I would get a good price for your short "big" men and grab a tall trainee
Unless something has changed with regards to height since I trained big men, 6'9"/206cm is just fine for a big man. Sure, the 7-footers train a smidgen more rapidly in some big man skills, but I never noticed much difference until I tried to train a 6'3" guy (complete disaster, I assure you). I've even trained as short as 6'7" without any noticeable difference in speed.
The rest of your post is fine advice, but I felt the above could use a bit of clarification.
