WWE like to keep things simple when it comes to how talent are presented to fans on TV.
Typically, most wrestlers on the roster are portrayed as being borderline one-dimensional (Roman Reigns is an inspirational sort with never-say-die inner strength, Ricochet a dazzling, goody-two-shoes gymnast and Lana a gold-digging bitch, for example). This keeps things straightforward and means the writers, in theory, know what a character's motivations should be in each segment or match they're featured in.
Then, there's the stuff they don't talk about. That real life history or a prior flirtation with the company before in an alternate, peripheral role that didn't exactly scream "WWE Superstar". This is something WWE has made a habit of ignoring over the years, but it's fascinating to delve into and see what select workers were doing before assuming their current guise.
It's a bit of a pick n' mix of pasts; there are jobs that had nothing to do with wrestling, token roles that were designed as a one off, long-forgotten indy gimmicks, lives well-lived in real-world sports and much more...