I can't comment on the exact legal details of the joining of the two companies, as I didn't see those (not being an owner of Render Legion :) ), but I can comment on the way it was done in regards to autonomy and in that regard it was very much a merger, which is how we've always referred to it (including internally).
Scatter has its own development team now, some from "originally the Chaos side" and some from "originally the Render Legion side", and I am not surprised there is no mention of it originating with the Corona / Render Legion team as its history really doesn't have an impact on the tool as regards the users - what everyone cares about (Corona and V-Ray users) is what the tool lets them do now, today, and not how it got started :) The same can be said for LightMix, or the PRG Sky; going into their history isn't of any benefit to users. I am happy to point out how we contribute in innovation though during presentations, as when talking about Corona it is good for users to know what the team is capable of imagining and creating :) So our history is not gone nor forgotten! But yep I wouldn't expect to read about that if you are looking from the V-Ray side as to what is new in Scatter.
As for the website, the fusion of the two into the Chaos site is about Corona taking its rightful place alongside the other products, and not about it becoming secondary or "lost in the mix". It's an ongoing process, we're aware internally that Corona is not as visible as it should be on the website, and discussions are always ongoing about the various ways the website can be updated to improve on that - all in reference to archviz of course, which is where Corona shines (we're not going to be tackling Hollywood VFX today any more than we were at the founding of Render Legion!) Like most things, it's an iterative process, as it takes a lot of work, and now has to cover all products.
These days, we're part of more things than we were before - if we take partners for example ("resellers", if you like); as Render Legion, we had virtually none, everything was done by direct sales. Now though we have Corona available through Chaos' extensive network of partners, who are getting Corona out to more people than ever before, and indeed I just came back from Partner Days in Sofia where I was presenting Corona to some of the largest partners, all to make sure that Corona is something they know about and understand, and that we equip them to be able to spread the word to more folks than ever before. I'd say we were "slightly more autonomous than we should have been" up until a year or two ago, where this opportunity went unexplored due to our history of never working with partners before. These are some of the unseen things (well, unseen unless you are a partner ;) ) that go on, part of the ongoing process of making sure Corona is fully a part of all things Chaos.
On those two pages - the docs page is exactly where you linked to, under the old corona-renderer.com URL (and no, it was never a page that was linked in the site map when that was our home page, it was always pretty much a "if you know where it is, you know where it is" page and that hasn't changed yet, til we find a good place to put it on the chaos.com site - maybe then it can even get a link to it from someplace to make it more discoverable :) ). The resources page is now divided in two, with the links to Max and C4D on the page it redirects to. The new pages are not identical as there was a lot of old, outdated stuff on the previous resources pages (links to material libraries that were from Corona 1.3, links to model collections that were 404, etc.) so we cleaned this up to provide links to things users would find particularly useful, such as tutorials and free scenes (we never had official free scenes before and relied on 7 year old free scenes hosted by users).
The "taking its place alongside the other products" will continue too, just as it does for Enscape for example, as we seek to make sure that anyone looking into Chaos products are fully aware of what options they have within our ecosystem and when they'd want to be making use of any particular product, as well as links between more and more products (Corona to Vantage being the prime example at the moment). Hope that little bit of background proves useful!
