I have heard college AOs talk about how leading up to application, they are everyone’s best buddy. When decisions come out, they become nobody or an enemy. Just saying that they know the game too. And the AOs rarely make the decision alone.
Please don’t feel like this would have changed a decision. Odds are against it.
Also remember, looking back at some threads here, that applicants can get really miffed if they contact an AO and don’t hear back. Many of the “dialogs” applicants are having are the AO dutifully answering emails, etc.
And as a last note on this… you’ll get to do it again for college soon enough. If your kid wants to make more of a connection in that process, the opportunity will be there!