Has anyone heard or know of any players that walk on to a team but end up earning a scholarship? How hard is this to achieve for a young athlete?
Yikes... them some long odds.
At least if I understand your question correctly... you're asking if someone ever comes onto the team as the weakest players and in four years turns into one of the best? Yes of course it happens, but it's a low probability bet. Heck when you get down too it, playing time and traveling with the team is going to be a low probability bet.
If playing games on the soccer team is important to the decision making process, it's probably better to look at a different school? Just my two cents-