All of the discourse around "canon" is just flavour and aesthetics. "Canon", as "a set of works that are officially defined as true and reliable", means nothing in terms of fictional legitimacy and media analysis.

People will accept or dismiss statements, even by the original creator(s), at every turn. People will accept or dismiss sequels, even by the original creator(s), at every turn. To some people the Alien canon starts and stops with the 1979 movie, for some others it stops with AlienS, or Alien 3, or it ONLY contains Alien + Prometheus + Alien: Covenant, etc.

Most Alien fans for example will absolutely refuse the idea, expressed by Ridley Scott, that Jesus was an Engineer. They will also refuse the idea, expressed by Dan O'Bannon, that the Alien is a sapient and sophont species and can develop a detailed culture similar to humans. They will refuse concepts given by these original creators of the Alien franchise at every turn.

Furthermore, there are a thousand franchises out there which switched hands a thousand times or were even continued against the will of the original creator(s).

"The one and only canon" isn't a thing. It is an illusion produced by the capitalistic necessity to establish a specific line of products as authentic and high-quality, derivative of the necessity for hierarchical religions to establish a monolithic dogma.
There are a thousand franchises out there that switched hands a thousand times or were even continued against the will of the original creator(s).

For creators and audiences alike, canons have always been a shifting set of overlapping systems of "legitimate" works, whose mutations and number vary according to the magnitude of the franchise.

Relinquish the illusion of an absolute and immovable canon.