I think you might be taking a risk feeling too safe here @sand93 . Those two players in second and third place are definitely still in within reach. Watch out!
I don't think you'd get the 30x multiplier, so I wouldn't try it for All Stars. But yes, generally speaking you can play Candy Crush offline. You would have access to your inventory but miss out on some of the events.
I was able to sleep all night both 2nd and 3rd place did the same and both are playing live and online. I’m still in the lead, will most likely advance and I don’t plan to stay up and play all night tonight unless they get within 200k points of my score.