It appears RS does make a lot of comments that maybe are to please/agree with those Powers that Be when the work began on the Prequels it was the aim as RS had said to Answer the Questions that NO-ONE ever answered in the Franchise.. Who was that Guy in the Chair, Why that Cargo which is when Jon Spaights was brought in. It appears down the line that some at FOX had felt the Engineers Plot was New and that maybe somethings are best left a Mystery (Xenomorph/Space Jockey Event) and so Lindeloff came in to make his Paradise Draft... It seemed at this point RS did agree that indeed the Beast is Cooked and that its better to try something NEW.
The talk and comments after seemed to indicate that a sequel should explore other things and leave the events leading to ALIEN a Mystery....
When we had the Change of Direction, it appears RS had a change of mind, by suggesting that you can go a few more rounds with the Xenomorph, and then about it has to be about HIM but you can Evolve HIM. (he was on about either the Xenomorph or David).
Its only when Alien Covenant started to not do too well, that RS then comes back with comments about how there is only so much Chest Pumping, and Snarling you can do, and about how he felt he was ahead of the Curve with Prometheus. Would he had acted the same IF we saw Alien Covenant make $400M+
And IF Disney did give the Green Light to a sequel but wanted more ALIENS kinda vibe to it, i do wonder if RS would then come out with praises for the Xenomorph.
So i do wonder if he says a lot to please the Powers that Be
But i do think that he feels there genuinely is only so much you can do with the Xenomorph Formula as it was laid down with the Franchise and i think he was a bigger Fan of the Engineers and Creation Plot and the Hubris in Creation kind of Themes.
There is not much information to Gauge if RS was a Fan of the Alien Engineers Project but he and Spaights had worked a lot together on the Broad-strokes of the Plot. It would appear he was more a Fan of taking it to something NEW regarding the Engineers though.
Certainly his comments overall regarding Alien Covenant and afterwards do seem to indicate to me that he felt you could not keep going back to the Xenomorph over and over for the Franchise and that you had to have something New.
His comments about being ahead of the curve with Prometheus, his comments about they want Aliens he give them $"£%£$^ Aliens, all seem to indicate to me that he feels the Xenomorph (while not cooked) is running out of Steam as in you can only do so much more with it.
And i Totally Agree.