Would it be wrong to presume that this Delo was CJ-4, rather than CI-4+, considering the TBN at 6.7 after 4600 miles? If it's CI-4+, it seems that the TBN dropped fairly quickly.
Not that I think that's a bad thing, but was just trying to get a better grip on what oil was used. In fact, if it's CJ-4, I think this is yet another UOA that shows CJ-4's to be everything the manufacturers claim!