Like how come RR and Boeing apparently have no data supporting the theory?
Maybe they didn't.... but perhaps those able to monitor at a lower level... could see something:
MISSING MH370: Satellites picked up "pings" from Malaysia jet, source says - Latest - New Straits Times
What is not said in the article is at what times/for how long these pings occurred... and if it was possible to work out the location of where the signal was....