It's amazing how quickly ROL have become the good guys and Castle the nasty big corporate. I can see the merits of both sides, TBH.
ROL have, obviously, spent a lot of time evolving RISC OS to the current Adjust flavour. Castle ditto to RO5. Adjust, though, just marks time on rapidly tiring hardware (Omega excepted, possibly), whereas RO5 has broken the link back to Acorn corporate stupidities of a decade and a half ago.
I, for one, would like to see the two prongs of the fork merge again. If it takes Castle to force the merger, then so be it.
Also, if Castle's Merlin project leads to an open evolution of the OS, rather than a secret and secretive one, a small round of applause is necessary.
(There does seem to be a myth developing that Paul Middleton singlehandedly rescued RISC OS, though, which doesn't gel with my memory of events at the time.)