Interesting info from the latest SEC filings per your post. I don't have any great takeaways. Ellis Donald Douglas JR is certainly a whale owning 82,000,000+ shares. I think we've talked about him in the past. I executed a very brief search on him and didn't get anything particularly exciting. He doesn't seem to have any other companies of which he owns more than 5%, requiring 13D/G filings.
https://fintel.io/i13d/ellis-donald-douglas-jr
Furthermore, although he appears to be accumulating ZNOG shares, his %ownership is remaining more or less the same over the last 10 years.
https://www.secform4.com/13dg-history/1797111.html
Maybe he is simply an ardent supporter of John Brown and his mission.