Develpoment is a very predictable function, dependent mostly on number of professional seasons, coaching, playing time, and a little bit on age. For draftees, who all have zero professional seasons, if you give them solid coaching and full time play they will develop along a predictable arc. Makeup has very little to do with this (much more to do with decline).
Regarding this player-- those arcs essentially never show an improvement of 30 in any one category, and 42 is out of the question (for a player like this who is too good to be a Diamond in the Rough). If you plan around mid 80s control and mid 60s VsL you will be far less disappointed.