I think that it is unlikely that we will formally 'become Azem' from a soul density perspective, for a couple of reasons. The first is that accumulating soul fragments to merge with requires each of the current bearers of those soul fragments to die. It also requires that the shard in question is either destroyed, or that we travel there in person to find the soul of the Azem who died (as was the case with Ardbert and the First). The other reason is that adding more soul density may make us paradoxically weaker due to Dynamis.
The main questions around Azem are historical ones. Where was Azem during the Final Days, and why were they 'missing' at the time of Emet's Amaurot? What is their backstory - where was their birthplace, how did they encounter the various members of the Convocation, and how were they chosen to be Venat's successor? How did they leave - did they just pack up and head off, or did the Convocation formally revoke their post first - were the rumors that we got from the general public accurate, or was there more to the story? There's mention of Azem having being previously censured by the Convocation during the short stories, and it doesn't sound like the departure was on very good terms, given that Emet had to create the corresponding soulstone in secret.
Some of these may just be subjects for the 'Tales' sidestories, but it's possible that we may have some answers from Pandaemonium and Myths.
