Yes, it's quite possible. The developers of Warframe often like to revisit old story elements. They might bring back old story arcs to provide a sense of continuity for long - time players or to introduce new players to the rich lore that has been built up over time. For example, they could bring back characters from the past stories and expand on their storylines.
It's possible that the developers have other priorities or are working on new content instead. Sometimes, bringing back old stories might not fit into their current plans or vision for the game's future.
Yes, I think so. The old story in Warframe has a lot of potential. By bringing back elements from it, they can create new storylines that branch off from the old ones. For instance, they could take a character from an old story and make them a central part of a new quest. This would not only reuse the old story but also expand on it in new and interesting ways. Also, it can attract players who left the game earlier because they liked the old story but lost interest as the game evolved. By bringing back elements they liked, it might draw them back into the game.
Ash's back story is also full of mystery. He is a master of the blade and assassination. While we know he is a highly skilled Warframe, the details of his creation and the true nature of his abilities' origin are not fully explored. It could be that his design was part of a secret project to create an ultimate assassin Warframe, but the full story remains hidden.
Sights can be very powerful. For instance, seeing an old building that was part of your childhood neighborhood can bring back memories of playing around there and all the related events in your back story.
Memories can bring back your back story by acting as triggers. For example, a particular smell might remind you of a place where an important event in your back story occurred. It could be the scent of a flower that was present at a childhood home, and suddenly, memories flood in, and with them, the details of that part of your past.