Your questions incorrectly assume steady state. The final approach was not at constant IAS.
Zorst, questions don't assume anything - statements do...
I know that this aircraft was not steady state. Still I do not believe that it would make the airport boundary if the engines were at idle. Steady state or not.
So again, my question: Can a 777 pilot possibly comment to roughly what power setting this aircraft had during its final phase.
Even if the answer is "more than flight idle" it would go some way towards knowing the facts.
PP