Well now, things are getting even more interesting.
It appears Tao has imploded. That could leave A-Inc with only one product - OS 4.
That explains the sudden interest in OS 4 - they have nothing else to sell! Based on the theory that Tao is for all "intents" (heh) toast, A-Inc will have no choice but to pursue OS 4 full-on. Otherwise they don't own anything.
Do you think A-Inc would be satisfied being a shell company only receiving royalties on OS 4?