[NoOne]

get 'controlling' persnality managers for your minors. they will create the best environment for players upto a 10-year mlb vet.

definitely spend as much as you can each year on development.

osa vs your scout: well, that probably fluctuates and further influenced by scouting accuracy.

if you have an excellent scout, i'd shade toward his numbers, but that does not preclude the OSA from being more accurate than a legendary scout. i assume it happens less often with better scouts. you'd have to flip to player editor or turn 100% accuracy on for a second to know for sure.

spend on minor league scouting too. even though it doesn't directly affect development, it can affect promotions and demotions due to poor scouting reports about development. that can stagnate a prospect as fast as any other misstep.

on that note, take control of promoting and demoting your best prospects - if you don't want to do the whole minor league system. shortlist them and force them to stay at current minor league level with individual player strategies. you'll only have to keep tabs on 10-20 players or so. just check-in after each scouting report and see if someone needs to move.