One thing to remember is that a coach may send 20 pre-reads to admissions of potential recruits. The number of recruits for an Ivy for example may be 7 or 8, and the coaches already have on their board the prospects ranked. Lets say that all 20 come in with satisfactory pre-reads that means that the coach has 20 options and they will go according to their board rankings, so if the 7/8 top recruits decide to go to that school, the remainder recruits are out of luck. That is why regardless, you have to be on the view of other schools even if you are told that a pre-read has been done and came great. Or know where you are on the rankings.
4Bases with numbers above, 7/8, the road is is definitely tougher for a position player. Typical recruiting class: 4 pitchers, OF, MI and either Corner Infielder with pop who can throw a couple of innings or C. Schools which have a higher number of recruits will increase the P, power hitters, and take a C each class.