Circumnavigating Flotsam?
There's another 4-5 hours before daylight in the search area when an a/c crew can get eyes and cameras on the objects the satellite picked up.
Then we will have a better idea whether one or more of the objects came from MH370 or a maritime casualty that's been circumnavigating Antarctica since???
While it's pretty barren North of the Himalayas, before that there's a bunch of high steep heavily vegetated slopes in extremely difficult terrain that could conceal a CFIT.
If it hit the side of a gorge, the debris could possibly fall into a high volume river leaving precious little visible.
Even if the flotsam does not come from MH370, there's still nothing in the public domain to put one ping arc over the other.