It's not an unique one, but maybe its value is exactly that.
Before reading Bill's great articles I had no clue about how digging into the Google's patents gives you the chance to understand where the big G is going toward. Not just that, his precious articles gave me also more method in analyzing...everything! Caring about the visualization of the concepts, putting in relation different stories, using your own judgement when it comes to conclusions and being rigorous when it's time to gather data. The articles of Bill helped me in understanding the value of all these pillars.
On a more personal note, once I saw that Bill was in Europe for an event. I messaged him on Linkedin saying I was bummed he didn't mention the event before on his Linkedin profile, because knowing he was there I would have tried to go. Bill - despite never having heard from me and receiving such a lunatic message - replied really graciously saying he would have done so. Well Bill, see you in Europe really soon then!