I actually have read this thread right from the beginning and I have (as usual) really enjoyed the speculative rubbish that has so far been posted.
Just to bring us all up to date;
1. Which one of you out there knows for sure that the crew had a problem before landing? If you do know, then let us know exactly what was said from your reliable source.
2. Having done more DGR courses and lectures in the last 50 years than most of you put together could ever claim to have had hot dinners, exactly who has established that DGR was involved? If you know that for sure, then why don't you tell us and stop us all guessing?
This thread is pprune speculation at its very best.
It seems to me that not one single one of you out there has the slightest idea of what went on in that Lufthansa flight deck and the only conclusion that I can come to is that none of you are worth listening to.
It really is that simple.