Though I have not seen the NFL study I imagine it may be flawed in it's methodology. The reason IMO that high picks return on Investment is lower is likely because all High picks command about 3 to 4 or more times as much money as 3-5th round picks and -- if you think about it is any player taken at that level even evaluated to be 3 to 4 times better than any pick??? -- no! It's a numerator denominator thing
The differences are subtle at best between players drafted. The difference in a 4.3 40 against a 4.6 seems astronomical at draft time. Reality, of the top 4 all-time NFL leading rushers at least 3 Emmit SMith, Walter Payton and Jerome Bettis were considered only average to below average at best for their speed.
Why were these players great- character, guts, determination call it what you will.
Succesful teams evaluate these things and value them more than non-sucessful teams. Also in football much greater "feel for the game" -- knowledge is needed.
As for baseball, it may make the least use of this evaluation. Baseball loves it tools, performance does not equal ability to the baseball mind. Potential, projectability, these are the things baseball loves (in general loves). One could argue that performance and character are hard to judge in baseball because the level of competition for HS players varies and who knows what their true character may be they've out talented everyone to that point - never facing adversity.
Funny though who do we love - players with character. Eckstein, Erstad, Marcus Giles etc. But for every Eckstein and Erstad that makes it a hundred of them never get a shot. There's a fine line between a 88 mph fastball and a 95 but 95 get 1st round money and alot of 88's get 37th round. As many 88's go to the hall of fame as 95s - go figure.
To pick a kid early on a hunch today can cost a scout his job (I would think). If he can point to numbers and the kid doesn't work out -- well it wasn't his fault.
Oops the more i write the more I like better stop NOW!