Is that a party night? Most 7pm closes at the MK are due to either the
MNSSHP or
MVMCP. If the MK is closing due to a party, then transportation continues to run because the party-goers need ways to get to and from the MK.
I'd go with the 7:45 ADR. Then take the monorail to the MK and hop on the boat back to the WL.