If the pilot was doing aileron rolls or barrel rolls the tracking system would still basically show the aircraft proceeding along its flight path while maintaing 1 G.
There may be some variation in altitude but not enough to alert anyone watching the system.
Sure, this would apply to anyone who knows how to do a proper barrel roll, but then they wouldn't have had an in-flight breakup!
Hopefully INDIGO will work like a Black Box and show what really happened with the aircrafts flight path...