I see your point SM, but I think that's only because Prometheus could have literally been made into anything to start up the prequels, and I thought for sure, like many others, there would be Alien(s) involved since it was a prequel to the original. A:C really didn't need to be titled an Alien film, for me personally, thought it would have been better if they just focused on the neomorph, and expanded on the new world they opened us up to in Prometheus. Obviously FOX wasn't having that...
I like Prometheus a lot more now that I can see how the films coincide, but definitely still disappointed that's where Scott decided to go. By that I mean, he should have made no ties to Alien and made the film it's own sci fi thriller that's based in the same universe, since his beast is cooked...That way the Alien remains a mystery, Scott gets to continue his love for AI's, and the fans may not get to see the Alien but we do get to see the universe expand.
In reality though, Scott will be forced, no matter what, to include an Alien in some way. All about the money.