<p>There are lots of threads on the customs and strategies of DIII recruiting and applications. Probably some of those have a lot more specific information and experience than this one so far.</p>
<p>My experience with this is entirely vicarious -- children of friends, friends of children, with some confirmation from what I've read here.</p>
<p>I don't see any downside at all in having the coach get an admissions read, and some downside in not doing it. If you do it, your son shows the coach that he is interested, and that he trusts him. That's good if what he's looking for is help from the coach and a healthy, long-term relationship with him. If your son doesn't do it, the coach is going to see that as either a lack of interest in the college or a lack of trust in him, and there's no way that is going to help your child.</p>
<p>When he goes to admissions, they are likely going to tell him one of four things: Shoo-in; Solid candidate, we'll probably take him if you really want him and we might take him anyway; Marginal candidate, we'll only take him if you say you can't live without him; Fuggedaboudit. The coach will probably (I hope) be fairly honest with your son about where he stands, except that he may not say your son is a shoo-in. If he's in either of the top two categories, the coach will probably recommend that he apply ED and offer to put in a good word for him with the admissions people, with appropriate cautions about their independence. If he's in the third category, the coach will make a decision how much he wants your son relative to other kids with similar admissions prospects, and will either (a) say pretty much what he would have said in the first two cases -- if you apply ED, I'll try to help -- but maybe with a little more urgency, or (b) not push your son to apply ED, although maybe encourage him to take his chances.</p>
<p>The way I think this usually works is that the coach probably has one or two (maybe more for football) kids for whom he can guarantee admission if they are at least marginally qualified. For everyone else, the coach can indicate interest and maybe some ranking of them, and the admissions committee will take that into account and try to make certain he gets a decent number (but not necessarily all) of the kids he wants. It probably doesn't matter much to the admissions staff whether this happens at ED or RD, but it matters to the coach, because he would love to see the kids he wants committed to go there. And realistically, he probably gets a higher percentage of the kids he convinces to apply ED admitted. It's also very strategic for the coach deciding for whom to use his "get in free" cards. He doesn't want to waste them on someone who might be admitted anyway, he doesn't want to waste them on someone who might go elsewhere, and he doesn't want to make his decision until the last possible moment (i.e., long after the applications are due). </p>
<p>So there are some fairly strong incentives for mild deception by the coach. He wants every prospect to believe he is solidly behind them when maybe he isn't quite. That's just life. I'm sure some coaches handle this with a lot of grace and integrity, and others fall short a bit.</p>
<p>Of course, you'll have to make your own decision about ED, for which finances come heavily into play. It's beyond the scope of this answer, except that if your son really likes the program and the coach, it's going to be hard to say "no" if the coach tells you to trust him.</p>