As the picture that CNN used now depicts, investigators say satellite-plane pings suggest the plane was spiraling and "descending at up to 25,000 feet per minute (284 mph)."
I'm not an expert, but with the physical forces acting upon the craft at that speed, while spiraling/twisting as it descended, the plane was likely being torn apart during descent with pieces thrown out in multiple directions during those seconds. Depending on the location of each spiral or loop and how far out from any center point each spiral might have been (or in over-lapping spirals), pieces could have gotten caught up in different current patterns anywhere in that large area.
They don't say in this article how "tight" or loose the spirals were, so there's no way to measure the breadth of the debris field before water currents took over. The picture on the site (above) has debris found in 2015 and 2016 in the southern Indian Ocean covering a huge amount of water area,
As Tomnod Staff said previously, and as many Nodders have concluded from working different campaigns, water searches are extremely unlikely to yield the results that people worldwide would HOPE to gain. Most debris, by now, is submerged, even if some is still being moved about within sub-surface water currents. Those pieces would NOT be sitting atop the water, especially now, so long after this tragedy. Eventually, but randomly and over extended periods of time, the Indian Ocean might throw out an undiscovered piece, but there is no guarantee for even that. Most of the pieces have likely settled in a large area resting on the ocean floor.
We ALL wish a Tomnod campaign could solve this mystery. But it would be futile and would only waste thousands of hours of volunteer resources while renewing Nodder frustrations that the existing technologies just cannot help in all circumstances. Please do NOT look for any new campaign regarding MH370, as the likelihood for this is extremely low.