wow that is creepy!
i would go about it a different way.
i would send out a memo to all families stating that for saftey issues you will be locking the door at all times. Also ask all parents to lock the door behind them when they leave. Give it a few days and then see if the DCD is still acting creepy. If so then I would confrot him right away.

one of my kids moms BF comes to pick up the son and he always tries to open my front door before knocking. He said to me one time hey this is a busniess you need to leave that door unlocked. I said no way not going to happen. Told him that it remained locked for saftey reason for the kids. he then understood. However, a few times when other parents did not lock the door behind them, he walked right in. I told him that I needed him to make himself known before entering. He never did it again

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