What time do they start scanning people in at the DTD Monorail entrance? If your ticket is scanned there, does that count you as "in the park"? Could one conceivably do this in time to get a BG at park open?
Yes, it is an official Disneyland entrance gate, but they do NOT open the gate before park opening most days. Usually they wait until official park opening. Even if you were the first in line, it may not be fast enough.