Propduffer,
You highlight the source of the concern.
The unwillingness of Malaysia to openly disclose whatever data they may or may not have introduces the uncertainties everyone is struggling with.
We don't know the fuel state because we really don't know whether the aircraft climbed and descended as suggested from the time contact was lost until the MEKAR fix. That blurs the possible landing space hugely.
It also fuels all the rumors and conspiracy theories. I'd be happier if Malaysia just admitted that their radars were off/unserviceable at the time.