When we've gone on DME to the Poly it's been in combo with WL and the GF. Sometimes you will go to WL first, but DME always will go to the Poly before the GF because of a turn the buses can't make going the other order. Other than that, however, there's no set order and you may or not be grouped with those resorts. During off hours you can find some odd groupings.
If you use the DME luggage tags, your bags will not travel on your bus with you. They will be collected behind the scenes at MCO and taken on a truck with other bags. They will be delivered to your room up to three (sometimes four) hours after you check in (provided your room is ready at that time).