In my mind you can’t really take Prometheus/Covenant as “Alien” films. They very clearly don’t fit in that way. They’re basically their own series that’s simply set in the Alien universe (i.e. look at Guardians Vol. 2 vs. last year’s Cap: Civil War - ostensibly the same franchise but wholly different in so many ways). In my mind the intrigue isn’t the prequel/how the aliens came to be element, that’s really nothing more than an inconsequential connective tissue that ties the two series together. Rather the Prometheus/Covenant films are far more interested in philosophical and thematic ideas that don’t have a whole lot to do with the Alien films proper. Honestly, at the core of these films, I think they share far more with Blade Runner, despite their Alien packaging.