Well.. that filter definitely worked hard during that OCI.. and I must admit to having at least some concern over the condition of the engine when I saw the gunk that had collected, as well as the overall condition of the oil. Was going to ask if you got a used oil analysis, when I scrolled down and saw the used oil analysis you posted.
I have to admit, it looked better than I expected. Will it convince me to run my oil and filter out to 17k miles? I'm pretty sure I will never run an OCI out that long. I think my limit is about 10k miles.. might go 15k with a FU and the right oil in the car, but it would have to be the right confluence of circumstances and conditions.
Having said that, I certainly agree with you regarding getting value out of the parts and fluids that go into the car. I'm the same way, but in my case, since I have a huge stash of filters that are not of the 'premium' type (Motorcraft, Hastings, Federated, and Bosch 'jobber' types) and a lot of conventional and syn-blend oils, I tend to stick to 7,500-8,000 mile OCIs.
I think you're probably on to something in regards to the Ceratec fallout.. might be other stuff in there too, but I can definitely see the Ceratec falling out of suspension and/or getting picked up by the PUP and getting left in the filter. If it sat for a while, then any of it that was suspended in the oil left in the filter would likely have settled out over the 4 months it sat.