Red Rings
ana and Galaxy Flyer, if the distance rings can be regarded as position lines at known times, then using the max ground speed (and min GS of zero) out of the first ping ring corresponding to one of the early radar fixes, you can create a running fix on a later ring.
Actually you will produce two running fixes; one in each direction outward or along the initial ring. This will produce a probable area enclosing a 'tree-branch' set of possible tracks as you move towards later rings in this way.
This will enable someone with earlier 'ping' data to resolve the distance limit on the two final arcs (actually one arc with the adjoining satellite's coverage area already eliminated).
The Malaysians may be waiting for the USG / FAA to do this for them so that they can blame them if it goes wrong.