This is a good point and i am interested so see what happens. All i can think of is LCCC as perhaps Saphira didn’t find an entrance as a result of her going berserk upon finding laura's hair. I think you have hit the nail on the head with El and elite four, so far it seems as though lin wants us to gain access to all the keys, so befriending El, as we already are trusted by the other members , makes sense. I personally think that the other keys, ivory and gold, are gonna play a huge role and is probably the reason as to why Lin does not care that we obtain the other four. Perhaps all six keys are required to truly from the new world and, assuming the last two keys are literal keys and not metaphorical, our final bout with lin in the "beta" new world could determine who gains access to said keys and thus the fate of the region.