UK publication The Guardian posted an article today regarding the contentious fractious history of several bands, and one of them is Yes. The text features quotes from Trevor; for example, he relates the memorial for Chris Squire he and Shelley held at their home in July 2015.
https://www.theguardian.com/music/2016/aug/25/ub40-stiff-little-fingers-yes-bands-that-split-in-half
I imagine nothing will dispel the ongoing legitimacy debate regarding the concurrent activities of the current lineup of Yes and ARW, but as each outfit believes they are presenting a valid expression of Yes music, it is up to audiences to support and enjoy whomever they desire.