I agree that a college does not cause one to have a particular MCAT. If you don’t study, you dont do well. However, schools with higher average MCAT scores are just that. You will be better off with a higher MCAT when trying to get into medical school.
I suppose one doesn’t always get in with a 4.0 and 99th percentile MCAT, but the data from AAMC says you have an 83% chance of admission which seems pretty good compared to a 28% chance with a 4.0 and the average MCAT score of 501.