Both Captains are very good professionals with more than 20 years flying commercial airplanes. One of them is a TRE/TRI who has flown in the Spanish Airforce as flight instructor on the F5 fleet.
Doesn't it remind you about the Lufthansa accident in WAW ??
"I am the Capitan, TRE/TRI in the right seat, go-around is not an option..."
...without some serious malfunction within A/C or ILS...
As long as this possibility cannot be excluded, any further speculations
are completely fruitless.