Piece of advice: Plan your training properly, in order to get the most out of a player's potential with minimum salary impact per season, so that you can still manage to maintain your league posistion financially and still able to give maximum training to the youngster.
Don't need to push a draftee's salary to sky-high figure before he even reaches 21yo, if you would struggle financially to keep him in your squad. Always remember that the best players do not necessarily earn the highest of salaries (at least in BB world, that is). Instead, try your best to build a player with balanced skill sets in his tender age, in order to "cheat" the BB salary calculator, because only a few of the main skills per Preferred Role are used in calculating the players' salary. So, if you train JS/JR/OD/IS (in rotation) with your SG, for example, the salary impact next season would be significantly lower than if you train JS/JR fanatically the whole season. If you continue to do this every season, you would only need to pay a fraction of his max salary per season until he matures. Only when a player's age reaches 21/22, and if his potential and salary indicator still permits, then focus directly on his main skills to shoot him up to the sky. When finally his potential cap has touched base, you would have an all-round SG.
If you pushed a player's main skills too early on, let's say HND/DRV/PAS of a PG until legendary with lousy JS/JR/OD, before he reaches 21yo, no doubt, he will become the superstar player in U21 squad. However, when he is 22 and since his main skills had been trained to the max (and his salary will be kept at the max also), he simply slow down dramatically in training due to the salary cap. Therefore, you will be left with a very good ball handler and passer, but lousy shooter from the outside. From my NT standpoint, this simply is not acceptable for a PG.
Just my opinion.
Cheers.
PS: And FYI, I'm quite happy with my current NT squad, although we are not ready yet to rub shoulders with elite teams.