I believe this accident will demonstrate that checking for a positive rate of climb after a bounced landing is NOT enough of a condition to raise the gear.
Ironically, when they raised the gear, there actually was a positive rate.... After the bounce.
There must be a second condition: full thrust obtained by the engines, not just TOGA selected but with engines not spooled up!
But... a pilot should know this instinctively.
Forgive my probably ignorant comment. Does instrument lag enter the equation or are the aircrew relying on external observations, looking out of the window?