Yeah I think 800k- 1 mill max is a more suited price range for his set of skills
Your part on tactics is true but still one position training a 22 year old 6'6 player in inside skills still take a long time. You are also right in sayin it depend on the right height. I would train a 22 year old if he is above 6'10 but 6'6 is too short.
At 16 REB, 12 ID, 6 IS, I would say is significantly lower in value compared to 11 RB, 11 IS, 11ID due to the fact that RB trains significantly faster than IS/ID. With the 11RB, 11IS, 11 ID guy going for probably around 2 mill, that guy will probably be around 1.6 mill or so. Not to mention he will be also 23 by then.