So you cant tell the parking lot attendant that youre just "dropping off or picking up" at any of the 4 parks? (example, HS) "Im dropping off or picking up my brother"
Yes, you can.
There are designated drop-off/pickup points for all 4 theme parks.
But, the designated drop-off/pickup point for MK is at TTC, and
therefore, requires the guest to ride Disney transportation to the MK gates.
There is no place for a guest's car to stop near the MK gates (that's a high-level bus area.)
So, it has been suggested that you pull into the Contemporary Resort lot and drop
a guest off there, with a walk to MK as the plan (see map below.)
But, during very busy times (including Christmas Week, Spring Break Easter, Independence Day holidays)
there can be times when the entire MK parking lot will be closed to further cars, and just trying to drive
there will be difficult. It's not unusual to find problems getting to the monorail resorts' parking lots on those days, as well. (Especially if you are not a guest of those resorts.)