None.How many meetings did you sit in on to come to this conclusion?
Just looking at the results from the last decade of how many kids left the program that had no business leaving. And Cal himself has been quoted as saying he NEVER tries to talk a kid into staying.
I take that to include kids that should be staying.
When people tell you who they are, unless I know them personally to be different from what they announce publicly, I take their word for it.