Much can happen in that time frame--coach switches schools, grades aren't what admissions wants, etc. I always wondered how an "early commit" feels when the coach recruits 2 or three others for his similar position after he "commits."
keewartson was the first commit of his class to his college, and the coach promptly recruited two more players for "his similar position" after he committed.
What keewartson did....and others in his position (pun intended) should do....is work their butt off. He also will need to beat out several upperclassmen to play this year.
Don't expect the coach to recruit only one player for the position. If not this year, then surely the next year there will be more of the position coming in. The coach needs to account for injury, grades, yada yada yada, that can shorten his roster. keewartson's coach told him something on the order of "after pitchers and catchers, he would like fill his roster with all short stops." That being said, be versatile and ready to move into any position the coach puts you in.