I may be mistaken but at least with amplifiers aren't they just rebranded Pioneer? Same may hold true of their headphones.
Sorry to burst your reality bubble, but Onkyo Amps are not just, I think you mean relabeled, Pioneers. They are their own entity!
As far as Onkyo coming out with Cans, it doesn't surprise me!
Paradigm just recently started a new Division named Paradigm Shift, that is taking advantage of the growing "Personal & Portable audio niche, as well as the wireless DAC and wireless Powered Speaker (maybe even digital) niche.
It's becoming a more isolated society and this niche or genre of audio, I just read, is the fastest growing market on the audio scene.
It's fine with me, as I deal with massive chronic pain on a minute by minute basis, due to a failing Autoimmune System!
And it kind of sucks too, thought, because I had just built (by mostly newer used components) a great mid-budget Home Theater System. Now that I live in an apartment hell, that dream has virtually ended!