The FP was nervous about performing a relatively challenging, visual 'Slam Dunk' approach because he had never previously landed a Boeing 777 'by hand'. He was struggling to acclimatise to the Boeing control interface, having accumulated most of his career hours on the A320. His previous 777 training landing had not gone well (the IP on that flight stated that the FP was "not well organised or prepared", "deviated from multiple standard operating procedures" and "[did not take] his feedback seriously enough"). It was also the first time the IP supervising him had ever performed this role.
This unfortunate combination of factors meant that the FP represented a greater risk than a "typical" trainee for this particular landing.
Fair point, but surely there will always be a range of acceptable ability levels for any group of trainees in any field? Had this individual's ability been well below the norm, he would have been suspended from training or sacked outright, so the fact that he was being given another chance shows that he was still in the right ballpark, even if at/near the "bottom of the class". Perhaps my previous post should have stated "He was not significantly more dangerous or unsafe...".
And the concerns about the FP's performance which you have highlighted demonstrate that the IP failed in his duty: namely, to monitor the trainee's actions closely and intervene before the situation became irrecoverable. Please understand that I don't envy the brand-new IP - speaking as a fairly experienced instructor myself, it was not an easy situation to manage, but that's the nature of the job!
As with most things, there was far more to it than simply "The trainee f**ked up". The root of this goes back to the decision by the roster planner to crew a weak trainee with a brand-new IP. Of course the FP must shoulder some of the blame, as does the planner, but the captain/instructor is primarily at fault.