What do you want to achieve for MM? Do you want to be near the front of the turnstiles? Are you headed for Peter Pan?
When I go MM is usually at 7AM and that means DL doe snot open the turnstiles early. At 7AM they open which means it matters more if you are near the front...or back. If near the back it can take 10+ minutes just to get into DL which is a bummer as it east up your MM hour.
For 8AM MM I don't know if they openb the turnstiles early or not and hold folks at a rope in the hub. Inthat case it does not matter quite as much where you are.
Anyways, I always try to be near the front or at worst, within 10 groups of the turnstile. Do do that you need to be at the DL turnstiles with your body standing in line probably 45 minutes early.
Here are some timing issues when driving. If it was me I would:
1. Drop off large portion of your group on Harbor entrance first so they can get in line at the turnstiles. Make sure they have their park passes.
2. A small group or maybe just the driver,
with their park pass!!!, parks the car and with haste tries to meet the group. If they get admitted into DL before the driver gets there, the driver will need to meet the group inside (and find them!).
See "Hidden Time Losses When Using a Car At DLR"
www.disboards.com/showthread.php?t=1381580
If it were me I would be dropping off the larger group 75-90 minutes before MM, then heading to the parking garage ASAP.