I will be staying at dolphin first week of January so I have to ask you what issues you are talking about with regards to
MDE/staying at Swan/virtual queue. I believe that with trying for the virtual queue, it doesn't matter if you stay onsite or not ( everyone is eligible at 7:00), so why would staying at the swan affect this (if that is what you are insinuating). I know linking these reservations can be wonky, but I don't think that should matter either way.
Now, did you try to pay for a $ILL? Because your Swan reservation would have to be properly linked to your MDE to be able to purchase at 7:00, versus park opening for offsite guests.
Please correct me if I'm wrong on this: my one Epcot morning is our check in day at the dolphin and want to make sure.
Maybe this is the wrong place to ask, but on my check in day, can I park my car at Dolphin around 7:15am and just walk to international gateway and be let in for early entrance without checking in/contacting the dolphin that morning? We were planning on walking back and grabbing our bags from the car late afternoon to check in.