Another "the draft is so easy, just get stars with every pick" post.
There is no magic formula for building a team. It does not exist.
It is guesswork built on just raw data - it has no way to account for personality, work ethic, injuries, fit with other teammates, coachability, off-field drive to improve (fitness, game film, etc), family, salary cap, agents, etc, etc - all of which (plus other factors) has a definitive impact otherwise the draft success rate and free agency success rate would be extremely high and sustainable and follow GMs wherever they went.