Blue has an absurd amount of firepower if it gets cold. Vista is weak because it's like 150' wide, not because they aren't willing to run guns. Upper Main Street is weak because Blue runs Lower Main first.
Paradise takes about half their capacity, Home Stretch will use up around a fourth, and Coming Soon can run off basically an asthmatic hamster blowing into a straw with the leftovers going to Tubing, the Horseshoe, ski school, and the top part of Tut's Lane to link both lifts. Seriously, the whole of Half Off Fall takes less air than three guns on Paradise. I'd easily believe Blue could open with Paradise first.
However. They have a lot fewer guns per hundred feet on Paradise than, say, Main Street. They may need more than 32 hours of cold weather to open that side of the hill (yes, they've gotten Lower Main open that fast) or they may open it but have to keep building depth there. They also might not get Went Recently open on day one - the guns there, like Burma, just aren't as productive in typical early season conditions as compared to the Paradise or Main Street models. Burma's opened really, really thin recently, and Burma doesn't have a steep section and it's narrower.
Dreamweaver probably can't make opening day either, not if they also run Home Stretch, but they likely can run a few guns at thin spots to get a head start. If it breaks seriously cold - mid teens, say - or once Home Stretch is in decent shape, I expect we'll see Dreamweaver then Nightmare very soon after. That's the Upper Main Street equivalent. Everything else off that peak takes too much air to connect back to the lifts.
Dark horse option - if it's really cold and the wind is favorable, Challenge -> Falls -> Home Stretch can run. If they go for it, that could be open after two days of around-the-clock temps below 22 degrees, plus grooming time.
Blue does not mess around with making snow. Within the limits of their system, they run pretty much 100% until they hit "full depth" on every trail. The Comet peak has more automation than the opening day trails on the Main Street peak, and once they can get off Paradise they should be able to expand quickly, weather permitting.