Isn't it a systemic error of the airline to put a novice at the type (PF) for the first landing at a demanding airport (SFO) together with yet another novice in his job, the training captain? It was said that they were both experienced pilots but obviously that did t help them here, now did it. Isn't this the biggest mistake to put these two newcomers to type and job together?
But how would a trainer ever train anybody. A new trainer will always be inexperienced at training until he's done some training. In all honesty training an experienced Captain should be much easier than training a new FO so this was probably considered a gentle way of breaking the trainer into his new job?
I'm assuming here that the trainer had previously done a number of sectors training under the supervision of an experienced trainer sat on the jump seat