I don't follow...on a crowded holiday weekend right now with the system as is, what would stop someone with an Epcot reservation going to MK at 2 PM and "overcrowding" it, provided they actually go to Epcot first? What difference does it make where someone was at 11 AM if they're showing up somewhere else at 2 PM? They can still be denied entry if it's at capacity.Because when MK fills up on a holiday weekend, they don't want people with hoppers saying they'll go to Epcot, but then really go to MK and overcrowd it.
Otherwise, they'd have to have an additional reservation system such that on a day in which the MK is 'full,' they can only reserve to go to the MK if they enter only have 2 PM. And then if they decide, "Hey, I'm in the area at noon, let me hit Epcot for lunch, and then they can't get into Epcot because their reservation is for MK.