Congrats on all the interest! If he has more definite offers from schools he likes better, then he's in a good place. It all will feed into the gut decision that he has to make. I'm a bit concerned about your statement "the admissions office could not guarantee admission from his pre-read" - that's pretty chancey. And that the coach would understand if he went elsewhere. If he has offer more precise "offers", pay attention to what those schools are saying. Also, if he decides to go with this one, does he have backups where he thinks he could get in without coach support?
Good problems to have.