The Skycrane helicopter that OP referred to is a true beast. It can lift heavy tanks and intact electricity towers. I won't be surprised if it gets used to lift the containers one-by-one.
Wow, the Chinook looks so tiny in comparison to the Mi-26.
40ft container maximum weight is 67,200 lbs. Skycrane max payload is 20,000 lbs and Mi-26 is 44,000 lbs. But do you think all the containers are at max weight? The ones on top are the lightest and the helicopters might be able to help with them after all, or maybe we can find a way to use two helicopters per container.
Can be heavier than that most won't be the max gross tonage. The biggest hurdle might be knowing which ones they can pick though. In not sure if the shipping company keeps the weights of every container on file somewhere.
It can lift at least 56.8 to 62.5 tons, depending on your definition of tons. The heavy containers have been placed on the bottom of the ship for better stability, leaving the lightest ones on top.
https://www.youtube.com/watch?v=iW_IxNLNvrY
https://en.wikipedia.org/wiki/Mil_Mi-26
Even that is not enough. It can lift 20 tons, and the 40 foot containers on this ship are heavier than that.