Given the holistic and unpredictable (from the student’s point of view) nature of many of the highly-competitive-for-admission schools that they are applying to, a school saying that “we expect you to maintain your academic performance through senior year” (without any specific thresholds) will probably cause a lot of worrying by a student getting his/her first B or two in senior year. After all, even if the risk of rescission is low, the stakes are high – if rescinded in the summer, the student has few options other than open admission community colleges and perhaps the least selective four year schools that are under capacity even up to the first day of classes.