When you start a season and go to the Baseball America Top 100 prospects, it will only let you recruit an average of seven or eight players. All the rest will be unavailable. Some players require a level 4 batting coach or level 3 pitching coach. You will probably not have a good enough coaching/prestige yet, however when you fill up all the things you can recruit anyone desired. If you do not meet those requirement, they will not even consider your college. Also, it will only let you recruit out of need. For example, if you have two freshmen third basemen, you will not be allowed to recruit any more third basemen.