Unlike Hyperion.
Err, whom is Hyperion exactly stopping?
Context is such a beast, nice of you to leave it out entirely.
For sake of argument, let us assume that Cloanto wins in court, and that ownership of OS3.1 source code etc. ends up at Cloanto. As you have mentioned, this does _not_ necessarily mean that everything that has been shipped with OS 3.1.4 will be owned by Cloanto, and it certainly does not mean the Reaction classes will be owned by Cloanto and chances are high that Hyperion will continue to own the Reaction classes.
You have written that what you will do, is to talk and wiggle your way to continue the development of OS3 further.
But for Minuous this is not an option as it would mean "signing up with Cloanto", his decades long nemesis - too much camel meat to swallow.
So he would just quit, he says, but I am not sure I believe that he would. If history is anything to go by, he would continue on his own, copyrights and NDAs be damned.
And it would not be Cloanto's copyrights and NDAs he would be breaching by pushing on with Reaction classes for OS3, it would be Hyperions.