What if Alien 5 starts off on the Sulaco and ends on Fiorina 161 with Ripley crashing?
You probably could sandwich an 'ALIEN' movie in there. In order for the continuity to work, you would need young actors, though. You would need a 36 year old playing Ripley and a 30 something playing Hicks. Also, Newt would have to be played by a girl. Obviously, Weaver, Biehn and Henn are out of the question now. How would you explain Ripley's mysterious aging and de-aging? Sci-fi mumbo jumbo bollocks aint gonna cut it.
Some people will argue that these characters can only be played
by the original actors but what they forget is that those portrayals are just the actors interpretations
of those characters. Any well cast
actor can do it. Other actors playing those roles are just as valid. The real problem is America's 'Culture of Celebrity' that takes precedence over good story telling. We've seen it multiple times already where older actors - getting beyond their ability to portray characters they excelled at - have returned. As a result, the story is written to accommodate justifying having these actors in place - and these stories are generally shit; or mediocre at best. Bringing back aging actors has proven time and again to be the most damaging and wasteful means of making these movies.
'Indiana Jones and the Crystal Skull', 'Terminator Genisys' and 'Star Wars - Force Awakens' all suffered because of this 'Culture of Celebrity'. Each one of these movies made it a priority for the story to fit the actor - and not the other way around. And sure, while Ford, Fisher and Schwarzeneggar all put in great performances and were the best thing about these movies, they were each just jewels buried in a turd. There was nothing to be gained for the greater good of these movies by using these actors in those roles because the movie was a vehicle for them rather than being a decent narrative.
We really needed a fresh actor playing Harrison Ford in a rollicking 1930's adventure. Fans want to know more about the war between men and machines in 2029. What exactly did happen to the Galaxy in the weeks and months following the Emperor's demise? These would have been much better scenarios to explore in cinema, but no. We had to choke on derivative at best cinema just so familiar (aged) faces can reprise roles they made their own. The fact is, all these actors were past their ability to do the story justice - and it showed.
It's not enough to just recast the same actors and shoe horn the story that really doesn't need to be told around them. After all, there are many movies and TV shows like 'James Bond', 'Sherlock Holmes', 'Doctor Who' which have strengthened because they have not been constipated into oblivion by having the one actor constantly representing the character. Fresh actors have given New Life and a fresh approach to every one of these very popular shows/movies. You will also notice that not one of these is American based. Only does the American entertainment industry insist that alternative and worthwhile interpretations of characters be non-transferable.
So will we see an ALIEN movie sandwiched between 'ALIENS' and 'ALIEN 3'? Sure. If the American film industry (and the fans) can get behind the idea that actors of appropriate age other than Weaver and Biehn can play those roles.
But I doubt it. It would be cool, though.