I never understood the need for players to inflate their height, especially in the NBA where you can get measured. Does the NBA have a combine like the NFL?
Not being a decent shooter or being able to defend the pick and roll adequately will hurt his draft stock more than being 6'6".
smaller guys inflate their height and taller guys tend to deflate their height. Kareem was notorious for this listing himself at only 7'2...he was much taller than that. Sir Charles was only 6'6 in his dreams, although his arms made him effectively that height.