Pre-Check is a random selection if you are invited into the program. My understanding is that DL has placed all DMs on the list. I've gotten "selected" about 90% of my opportunities. Quite lovely.
As for MCO...I thought they did have a first class / elite line there. But, quite honestly, their security lines are such a mess and so full of tourists that I'm not sure it ever got them or us anywhere. It's one of my least favorite airports to negotiate.